It is the world's largest freestanding building, an airship hangar abandoned by Soviet military at south of Berlin a decade ago. The $110 million hangar is 1,181 feet long by 688 feet wide and 351 feet high held massive airship. In 2002, von Gablenz's company, Cargo Lifter AG, was out of cash. A Malaysian firm, Tanjong bought the hanger for $24 million. Tanjong soon found that keeping the hangar at 78 degrees Fahrenheit year-round was a challenge. So workers welded shut the two steel doors, which weigh 600 tons each. To open the hangar to light, "we exchanged the steel skin of the hall with 20,000 square yards of translucent film," says Tanjong spokesman Patrick Kastner. "This makes natural tanning possible..." At 3,000 square yards, (the pool is) larger than four Olympic-size pools, and its artificial horizon conjures a faraway island. At the "shoreline" are 600 feet of sandy beach and hundreds of deck chairs. The Bali Lagoon has a grotto and waterfall, as well as the world's largest indoor rainforest, with 50,000 trees in 600 varieties--from palm to papaya--that thrive in natural light. The most popular attraction is a nine-story waterslide that propels sliders to 44 mph.

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