I recently went on holiday to Egypt. Our Egyptologist guide (who, by the way, has to qualify in the entie 5,000+ year span of Egyptian history, rather than dribbling off after Cleopatra's death in 30BC), said that Egypt has built a wonder for every century since the Ottomans gave them semi-independence after Napoleon. In the 1800s, they built the Suez Canal. In the 1900s, they built the Aswan High Dam. And in the 2000s, they've built the Grand Egyptian Museum.
The Suez Canal from space (via Wikipedia)
The Aswan High Dam from space (via Wikipedia) - trust me, it's really difficult to take in the scale of it from ground level
The Grand Egyptian Museum, exterior shots. Yes, it's aligned with the pyramids. There's an eleven metre tall statue in the atrium that had to be installed while the building was being constructed, in front is a sixteen-metre obelisk suspended so you can see the cartouches on the base, it's got the entire Tutankhamun collection, there's a separate building (to the right of the daytime shot) with Khufu's boat, it really is incredible, although time will tell whether it will indeed be considered an architectural wonder on the level of the Suez Canal or the Aswan Dam.
So, in answer to "why did humans stop building wonders?", we didn't, we just started building different types. Have a look at great construction projects, maybe you'll find a wonder that's as taken for granted as the Suez Canal was until the Evergiven got stuck.
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