[TheOtherHobbes]

I think it's interesting that this occasional architectural trope was invented by a psychotic emperor.

Never mind a meal - it's more fun to imagine the initial design meeting with the engineers:

"An outdoor dining terrace that rotates, oh shining light of the world? Yes, I think we can do that. Oh - and gold toilets too? Yes. Of course."

[cm2187]

France's most majestic castles are the result of megalomaniac kings and noblemen (Versailles, Vaux le Vicomte, etc).

[wsc981]

Germany's Neuschwanstein also fits the bill: https://en.m.wikipedia.org/wiki/Neuschwanstein_Castle#