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Halloween-styled passenger information display at the Alterlaa station (part of the viennese metro network U-Bahn Wien) on oct 31, 2017 It says "FLORID / FLORID NIGHT" and "B N SIE / BETRIIGHTLI" (instead of "Floridsdorf") They made it look like a supernatural being was at work here

IMHO, the most amazing building by Otto Wagner. Just look at the ticket hall! And the stone facade with those rivets! And the ventilation tubes which look like guards keeping a close watch on your money! And the glass ceiling! And the glass floor! Okay I stop now, promise.

in the Neue Burg there are located the Austrian National Library and 5 (?) museums

Nowadays, the Börse isn’t in this building anymore. It is used as office rooms instead. The building wasn’t even demolished during WWII but in the 1950 fire broke out and the hall burnt down. That’s why the facades in the inner courtyard look more modern.

oh, and in the first picture you can see a restaurant called “Griechenbeisl”. It’s Vienna’s oldest restaurant and the place where Marx Augustin performed first (”Hier sang sein Lied zum 1. Mal der liebe Augustin”)