This beautiful eden was once the vacation home of Tahitian royals before Marlon Brando bought it.

Site of James Cook's historic observations of the 1769 transit of Venus.

A 19th-century architectural wonder designed by the "father of the skyscraper."

This Dutch Colonial home is the oldest remaining farmhouse in Manhattan.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

Elevated freight railway turned wildly successful urban park.

New York's oldest magic store.

The only international border marker within the United States.

Longest canal tunnel in the world, abandoned in the 1960s.

A unique underground structure dating back to the 1st century BC.

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

The world's most famous cheese caves.

An amazing clockwork museum in the Val de Travers holds examples of various prestigious legacies horological history.

A historic observatory precariously perched at the "Top of Europe."

Series of underground houses inhabited continuously for centuries.

From carts to cars, this leftover Roman bridge in France has managed to survive for centuries.

The prototype for all Nazi concentration camps.

The remains of three Luftwaffe launch pads designed for manned anti-aircraft missiles.