Essentially there is a hotel being built in an old quarry outside shanghai, and it costs more than a F-22 raptor or a mid aged cruise ship, but it is 10 times cooler.
http://www.globalconstructionwatch.com/global-construction/songjiang-hotel-paradise-set-in-a-deep-quarry/
http://en.wikipedia.org/wiki/Shimao_Wonderland_Intercontinental
I'm thinking we can utilize this hotel outside of our cities, maybe in the mountains. I would love to see this in simcity 4, as it would add greatly to the variety of structures in the game and break the monotony of always building up.