This luxury villa isn't grand architecture. It's not made of titanium. And it's not even underground. But it's the first home in the world with a 256-foot-long double loop water slide going from its top balcony to the pool.

Click to viewThat's comparable to most water slides in amusement parks. The house is available for rent for families looking for a vacation place in Koh Samui, Thailand. [Lulu Holidays via Born Rich]