Architect Moshe Safdie had high hopes when he built the Sands Skypark in Singapore.  The Sands Skypark runs across three structures of  the Marina Bay Sands hotel.  The new add-on to the $6 billion dollar high-rise complex includes a pool that sits atop the hotel and is 55 stories above ground. 

The Infinity pool has attracted a lot of attention; it is nearly 500 feet in length and appears to be an edgeless pool.  If a visitor to the pool happens to swim over, they would fall into a basin that acts as a filter pumping water right back into the giant waterway. 

Sands Skypark is itself nearly 1,250 feet long and runs along a rooftop deck that in addition to the pool features shops, theaters, casinos, a museum and indoor canals equipped with an observation deck and a botanical garden.

While the casino is free to visitors, area residents have to pay a $70 entrance fee because their government says it is trying to discourage gambling among citizens.

Not only is this man-made body of water estimated to be the world's largest pool, but the hotel, which has over 3,000 rooms, is said to be the most expensive luxury hotel on Earth.  

A space hotel backed by Barcelona-based architects and Virgin brand mogul Richard Branson, is expected to be in the works by 2012.