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The building next to it seems to have what appear to be fission product filters on its chimneys.
...

^^^ Are you Poirot?

Is that really Spiderman with mini-Spiderman standing next to him having his photo taken?

Surely this is the Millennium Tower, San Francisco.

Cavendish Square?

Could be one of dozens of others though.

Something installed by a 17th or 18th Century king, duke, lord, etc. with more money than sense? ;-)