The largest stone moai on Rapa Nui.

The world's longest known cave system.

This replica of the Greek structure is in the heart of Nashville.

A historic hotel that made a cameo in Hitchcock's classic film has no intention of letting guests forget its fame.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

The world's second largest single-dish radio telescope, once used to contact E.T.

Former villa and estate of James Deering developed to preserve native tropical forests.

A historic presidential getaway on the continental United States' southernmost island.

An idyllic swimming pool tells the tale of Hemingway's trouble with women.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A monument celebrating the idea of reaching inaccessible places.

"We Seceded Where Others Failed."

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

At 207 feet, one of the world's longest continuous escalators.

A natural arch offers panoramic views of Yangshuo's karst hills.

Relics of Australia's convict past, and a modern scene of unimaginable horror.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

This expansive bridge in the Canadian wilderness was originally just built for friends.

Traditional 15th century Chinese garden in the middle of Vancouver.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

Home to three historic ships from the age of Vikings.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

The first declared National Monument in the United States.