http://www.theverge.com/2015/8/20/9181333/sky-pool-london-embassy-gardens
Developers in London are building what they claim is the world's first "sky pool" — a 25-meter long swimming pool suspended 10 stories in the air between two blocks of luxury flats. The transparent pool at Embassy Gardens will be three meters deep with a water depth of 1.2 meters, and will be constructed with the help of aquarium designers using 20-cm thick glass. The pool will allow residents to swim between the development's roof-top bar, spa, and orangery (a walkway will be available as well), with prices for apartments and penthouses in the complex starting at £602,000 ($942,572).