England's oldest surviving hedge maze has been confusing visitors for over 300 years.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

The world's largest rotating world.

The glowing blue Nymphaeum of Emperor Tiberius.

A house carved into a rock in the 1940s.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Venice's island of the dead.

Monasteries on rock pillars, once accessible only by frayed ropes.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

A perfect turquoise lake colored with glacier dust.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

The highest bridge in America was built for an almost unnervingly small amount of money.

Most-visited and most-photographed slot canyon in the American Southwest.

Commemorating the spot where the famous scientist fed his pigeons.

Great place to have a drink and a bite to eat in an atmosphere laden with New York's Bohemian past.

The largest stone circle in the world has ended up bringing up more questions than it has answered.

Ancient pueblos built into the base of a natural canyon wall.

This black shoreline is made up of exploded lava particles.

This strange geological landscape erupts with sudden bursts of water.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

The drama of nature in full effect in this Nevada State Park.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.