Underground pool connecting 2 villas.
a rope and slide both going into the pool? and a waterfall? YES PLEASE #NextDecks
Indoor pool by Keith Williams Architects.
27 Absolutely Stunning Underground Homes - http://www.buzzfeed.com/scott/stunning-underground-homes
Underground Indoor Pool Underground pool, chelsea town
underground house with pool--I'm not a big "dream mansion" pinner but this is pretty damn cool.
A great series of shots of the Lattenstrasse(sp?) earth-sheltered house development
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11 Mind Blowing Photos of Unreal Places (Nature Made Underground Pool in Mexico)