Ghosts at 18th and Castro
Queer San Franciscoâs geography is vanishing. The technology to bring it back fits in your pocket. Stand at the corner of 18th and Castro on a Saturday afternoon. The light is doing the thing San Francisco light does â gold, low, a little theatrical, like it knows itâs a featured attraction of the City. Tourists pose under the giant rainbow flag. A man in a leather harness and rubber jockstrap waits for the 24 Divisadero. Look across the street at 575 Castro. Itâs the Human Rights Campaign store now. They sell mugs and pride flags and t-shirts that say LOVE IS LOVE. In 1977 it was Castro Camera. Harvey Milk lived in the apartment upstairs, ran his campaigns from the storefront, and gave away film to anyone whoâd listen. He was assasinated in November of 1978. The shop closed soon after. The neighborhood named itself after a street, not after him. Three forces took these places. They didnât arrive in sequence. They arrived together, in waves, and they continue to arrive. The first is plague. San Francisco lost close to 20,000 people to AIDS in the 1980s and early 90s. Bartenders, doormen, regulars, owners. Bars donât close when business is bad. They close when the patrons disappear. The bathhouses were shut by city order in 1984 â a public health decision still argued about, depending on whoâs doing the arguing. Whatâs not argued: a whole architecture of queer intimacy was deleted from the map in just eighteen months. The second is rent. The Lexington Club, the last lesbian bar in San Francisco, closed in 2015 because its landlord wanted market rate. Esta Noche, the Missionâs Latinx gay bar, closed in 2014 for the same reason. The Stud, founded in 1966, lost its lease in 2020 and has been wandering ever since. The tech economy didnât hate queer people. It just couldnât see them through a spreadsheet. The third is the one we donât like to say out loud. We did this too. Marriage equality, anti-discrimination law, a Pride parade with corporate floats â these were victories. They were also exits. When you can hold hands at the Whole Foods on Market, you stop needing the bar that taught you how. When the apps moved cruising indoors, the gay bookstore lost its customers. Assimilation is a kind of erosion that feels like winning, right up until you look around and there's no on there. A short litany. Not all of them. Just the ones I keep thinking about. The Black Cat CafĂ© â 710 Montgomery, 1933 to 1963. JosĂ© Sarria sang Carmen in full drag to an audience of bohemians, sailors, and undercover cops. He ended every set with the room standing arm-in-arm: united we stand, divided they catch us one by one. He ran for the Board of Supervisors in 1961, the first openly gay candidate for public office in American history! The bar lost its license in 1963 for serving homosexuals. The building is a trendy restaurant/bakery now. Comptonâs Cafeteria â Turk and Taylor, summer of 1966. Three years before Stonewall, the trans women of the Tenderloin (sex workers, runaways, queens with nowhere else to be at 3 a.m.) fought back when the cops came to clear them out. Sugar in the coffee, glass on the floor, a purse swung at a beat copâs head. The cafeteria is long gone. The intersection sits inside the Transgender Cultural District now, the first such district in the world. The bathhouses â Sutro, Liberty, the Caldron, the 21st Street Baths. Sites of pleasure, of refuge, and eventually of an epidemic no one yet knew how to name. The City closed them in October 1984. Whether that was harm reduction or moral panic has not, four decades later, been settled. What is settled: a generation lost a place to find each other before they lost each other. A Different Light Bookstore â 489 Castro, 1986 to 2011. Where the staff knew which paperback to slip into your hand. Where you could read the Advocate at the front counter and find Audre Lorde on the back wall. It closed during the e-readerâs first wave, but it had been dying since the day Amazon launched a category page for Gay & Lesbian Fiction. The storefront has been three businesses since and is currently a gay bookstore once again. Esta Noche â 16th Street in the Mission, 1979 to 2014. The Latinx gay bar where drag queens performed Selena and Juan Gabriel for a crowd that knew every word. Where you didnât have to choose between being queer and being Latino, because everyone at the bar was both. The landlord raised the rent. The space is a cocktail bar now. The Lexington Club â 19th and Lexington, 1997 to 2015. San Franciscoâs last lesbian bar. Owner Lila Thirkield wrote in her farewell letter that the neighborhood sheâd opened in no longer existed. She wasnât being poetic. The bar is a cocktail lounge called Wildhawk now. There hasnât been a lesbian bar in San Francisco since. The Stud â 9th and Harrison, founded 1966, lost its home in 2020. The longest continuously operating queer bar in the City. The place where Heklina, who passed in 2023, hosted Trannyshack and a thousand drag careers got their first stage. The worker-owned cooperative that runs it has been hunting for a new space ever since. A bar in diaspora is still a bar. Barely. And then thereâs the one that didnât close. The Castro Theatre â 429 Castro Street, opened 1922. The movie palace where Frameline ran its festival every June, where Peaches Christ and Heklina staged tributes to Showgirls and Mommie Dearest, where you could sing along to Hairspray or The Sound of Music with a thousand people who knew every word. Another Planet Entertainment took over operations in 2022 and closed the building for renovation in 2024. They spent $41 million. They tore out the raked theater seating â the fixed seats that made the room a cinema instead of a concert hall â over the objections of a community that had run this kind of fight before and knew how it ended. The theatre reopened in February of this year with a benefit screening of Priscilla, Queen of the Desert. Sam Smith took residence after that. The original seats are gone. The theatre is not. That distinction matters less than it used to. So what do we do with a city that no longer exists? The plaque at 575 Castro names Harvey Milk but doesnât show him. The mural on the wall is beautiful but mute. The walking tours are good if you find them. None of these meet a person where theyâre already standing, on a Saturday, holding a phone. Here is a different answer: an augmented reality memorial layer for queer San Francisco. Phone up, ghost down. Stand at 710 Montgomery. The Black Cat appears on your screen â exterior in 1959, interior in 1961, JosĂ© Sarria mid-aria. Stand at Turk and Taylor: the lights of Comptonâs come back on, a trans woman pours sugar in a copâs coffee. Stand at 19th and Lexington. The Lex is open again. Stand at 575 Castro and Harvey is registering voters. He hands you a leaflet you cannot keep, but for a moment you can see his hand and his smile. This is not science fiction. The technical pieces are commodity. The reason it doesnât exist yet is not lack of engineering prowess. No one has decided it should. Thereâs one precedent worth naming. Queering the Map, launched by Lucas LaRochelle in 2017, is a global crowdsourced cartography of queer experience â pins on a Mapbox view, each one a sentence or two from an anonymous contributor. A first kiss. A coming out. A beating. Itâs powerful. Itâs also often flat. You read it from your couch, not standing on the corner where the thing happened. The proposal is the opposite move: take the memory out of the screen and put it back on the street. Borrow from the Germans, who have laid brass Stolpersteine in sidewalks across Europe at the last known addresses of Holocaust victims. Same logic, different layer. The City already holds the ghosts. Your phone just helps you see them. Our history has always been partial, oral, half-erased. The records were destroyed; the obituaries lied; the streets were renamed. Augmented reality is, literally, the technology of seeing what is already there. It is the inverse of the closet. A word on the engineering, because skepticism is fair. The capability for our project is already living in your pocket. Niantic Lightship VPS anchors content to real-world locations at centimeter accuracy using a crowdsourced 3D mesh â San Francisco is well-covered. ARKit Geo Anchors, ARCore, and WebXR mean it runs natively on iPhone, Android, or any modern browser, no app required. To rebuild interiors no one filmed in HD, neural radiance fields and Gaussian splatting generate navigable 3D scenes from a handful of old photographs. The conceptual precedent is also built: the Kinfolk project has been using exactly this stack since 2023 to create AR monuments for Black and Brown historical figures the City forgot to memorialize in bronze. The technology is almost boring now. The reason no one has built this for queer San Francisco is not that no one could. There are names for what this feels like. The Australian philosopher Glenn Albrecht coined solastalgia in 2003 to describe the grief of watching your home change while youâre still in it. He invented the word for communities living through open-pit coal mining in the Hunter Valley, where people hadnât moved but their place was being unmade around them. The concept has since been applied to climate refugees and to anyone who has watched a neighborhood gentrify with their eyes still in it. Solastalgia is the diagnosis for what most queer San Franciscans walk around with on a Tuesday afternoon. The French sociologist Maurice Halbwachs, who died in Buchenwald in 1945, argued that memory is not stored in individual brains but in groups, places, and objects. Collective memory survives because it has somewhere to live. When the bar closes, when the bookstore becomes a Starbucks, when the building stays but the seats are torn out, the carrier of memory is what breaks. Without monuments, communities lose direct memory of themselves within a few generations. Queer communities have always known this. Weâve just been making the monuments out of each other. The names handed down â Harvey, Marsha, Sylvia, JosĂ©, Audre â are the buildings we never got to keep. The drag house is a memorial. The chosen family is a memorial. The AIDS Quilt is, almost literally, fabric stretched into architecture by people who knew there would be nothing else. It is heroic and it is exhausting and it is not enough. The cost of forgotten geography is not nostalgia. Itâs that every queer kid who arrives in this city, or any city for that matter, has to invent queerness from scratch. They walk past 575 Castro and see a gift shop. They walk past 19th and Lexington and see a generic cocktail lounge. The history is under their feet but they canât feel it. And so the first lesson of being queer in 2026 becomes the same lesson it was in 1976 â figure it out alone, then find the others, then build something that matters. Again. As if no one ever built it before. That loneliness is also a literal demographic fact. AIDS did not just kill a generation. It killed the generation that would have raised the next one. The men who would now be in their seventies, telling sixteen-year-olds how to find each other, how to be safe, how to be brave, how to laugh through the tears â too many of them are dead. The mentorship that other minority communities pass down through grandparents and family friends did not survive. Queer youth in 2026 are being raised by TikTok algorithms and the absence of grandfathers. Geography is one of the few mentors that can outlive a plague. A building does not die when the people in it do. A corner does not get sick. If we anchor what was here to where it was, the City itself becomes the elders we no longer have. That is what this is. Not a monument. Not nostalgia. An inheritance system for people who were not supposed to have one. Stand at the corner of 18th and Castro again. Look across the street at 575. The HRC store hasnât moved. The LOVE IS LOVE t-shirts are still in the window. But something in your vision has changed. You can see the camera shop now, the campaigns being run from the storefront, the man at the counter giving away film. Thatâs not nostalgia. Thatâs the future of how a city remembers itself. We are going to build it. Not because we have the funding, or permission, or any of the usual prerequisites. Because too many people did the work of staying alive long enough to be remembered, and we owe them an address. If you have a corner in San Francisco that is haunted for you, tell us. If you have a photograph of a bar that closed, a flyer from a march, a memory youâve carried alone, send it. If you have an hour and a phone, walk a stretch of this city you think you know and pay attention to what isnât there. We donât need more bronze. We have phones, we have photographs, we have the dead and the living, we have the City itself. The only piece that has been missing is the decision to begin. Harvey is still at the counter. He is waiting for us. Tech Terms â A Glossary for âGhosts at 18th and Castroâ The technology behind the AR memorial proposed in the essay. For readers who want to know whatâs possible, whoâs already doing it, and what the words mean. ----- Augmented Reality (AR) Real-time virtual content layered on top of the physical world through a phone screen, tablet, or headset. The phone sees whatâs actually there through its camera, and adds something that isnât. The fundamental difference from virtual reality (VR): VR replaces your surroundings; AR enhances them. In the essayâs context, AR is the medium for showing 1977 on top of 2026, anchored to the exact corner where 1977 happened. ----- Visual Positioning System (VPS) A camera-based localization technology that uses a pre-scanned 3D map of a place to determine exactly where a phone is â down to a few centimeters. Far more precise than GPS, which is accurate to about 5 meters on a good day. Why it matters here: GPS can tell you youâre at 575 Castro. VPS can tell you youâre standing where the front door of Castro Camera used to be, facing the counter. That precision is what lets a ghost appear in the right spot rather than floating somewhere in the street. Niantic Lightship VPS is the most prominent implementation. Built by Niantic â the company that made PokĂ©mon GO â it has over a million activated locations globally, with strong density in San Francisco. lightship.dev ----- Geo Anchors Virtual pins that let AR content stick to specific real-world GPS coordinates across sessions and users. ARKit Geo Anchors is Appleâs implementation, available on iPhone since 2020 (ARKit 4). ARCore is Googleâs equivalent for Android. Why it matters here: a geo anchor is what makes the memorial persistent and shared. Every visitor who stands at 710 Montgomery sees JosĂ© Sarria in the same place â not floating randomly, not unique to one phone. ----- WebXR An open web standard that lets augmented reality experiences run directly in a mobile browser, without requiring an app download. Why it matters here: friction kills adoption. Asking someone to install an app to visit a memorial is asking them to make a decision before theyâve seen the thing. A link works on the device already in their hand â tap, allow camera access, the ghost comes up. For a community memorial that should be accessible to anyone curious enough to scan a QR code on a plaque, WebXR is the difference between a thing people actually use and a thing only enthusiasts download. ----- Neural Radiance Fields (NeRF) An AI technique introduced in 2020 by researchers at UC Berkeley and Google that reconstructs a navigable, photorealistic 3D scene from a small set of 2D photographs. Why it matters here: most of the Black Cat exists only as a handful of grainy black-and-white stills. The interior of Comptonâs Cafeteria in 1966 was barely photographed. NeRF turns those scattered images into spaces you can walk through. What used to require a film crew and a time machine now requires a photo album. ----- Gaussian Splatting A newer 3D scene reconstruction technique introduced in 2023 by researchers at Inria and the Max Planck Institute that does roughly the same job as NeRF but with dramatically better real-time performance. Why it matters here: itâs the technology that makes mobile-quality 3D scene reconstruction practical, not just a research demo. NeRF was the breakthrough; Gaussian Splatting is what makes it ready for someoneâs phone in the back of a bar. ----- Kinfolk Not a technology â a precedent. Kinfolk Foundation is a nonprofit founded in 2017 (originally as Movers & Shakers NYC) by Idris Brewster and Glenn Cantave. Their Monuments Project uses AR to place digital monuments of underrepresented historical figures â Toussaint Louverture, Shirley Chisholm, Sojourner Truth, Ida B. Wells, Fannie Lou Hamer, and others â in public spaces where they were never cast in bronze. Worth knowing: Kinfolkâs stated mission explicitly includes âBlack, Brown, Indigenous, and Queer history.â The community-specific scope proposed in this essay (a Castro-anchored memorial for SFâs vanished queer geography) is narrower, but the precedent is direct â and the conversation worth having. kinfolktech.org Read the full article
