An underwater city for the dead.

12,000 sq. ft. museum tracing erotic art from antiquity to modern times.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

The largest greenhouse in the world is home to over one million types of plants.

400-year-old garden, restored to beauty.

The twists and turns of this serpentine maze are over 170 years old.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

One of the largest sculpture collections in the U.K. features history's greats, from Bob Dylan to Galileo, in bronze.

For hundreds of years, this huge figure has been blessing visitors before they explore his body.

Stunning wetlands ablaze with pink lotus flowers.

A modern temple with an ancient philosophy.

An enormous dragon scales the walls of this 17-story temple.

A museum in a law office, filled with authentic and counterfeit goods.

On stormy days debris from this unfinished and abandoned skyscraper rains down on the Bangkok streets.

This elephant kraal is the only one remaining in Thailand, dating back to the 16th century when these massive mammals were integral players in war and trade.

A flooded Mexican cave that hides a river beneath the water.

A seemingly endless landscape of pure salt stretches far across Bolivia.

The rocks in this arid basin leave trails of movement behind them.

This small primate research island is teeming with playing, fighting wild monkeys.

A geological bull's-eye visible from outer space.

This dramatic sea spire is home to the world's rarest insect and is part of the lost continent of Zealandia.

Enchanting cave with a river crashing through the roof.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

This museum has a most unusual location: inside a giant, three-headed elephant.