Fantasy buildings are magical. Thus they follow the rules of magic and not physics. Much like this precarious turquoise tower towering over the the seaside in ways that neither man nor god intended. Sadly the top was chopped off so you can't see it extending all the way up into the clouds. I'm currently running a campaign with a similar tower extending into the clouds. Unlike fantasy literature, this tower has a significant anti air defense system which has the added side effect of preventing the players from getting out as well as keeping things from getting in. All in all a lovely electric pickle.
Have you had experiences with bizarre fantasy architecture or created some of your own for a game world? Let's hear about it!
Original art for this poster from here
LooneyDM *designs more towers*