The most alien-looking place on Earth.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

A Korean village where times stands still.

2300-year-old Roman road connecting the empire.

100 year tradition of fist fights, marked by marble footsteps.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Enormous statue of the Emperor of the Mongols.

Venice's island of the dead.

A miniature city, once ruled by the Queen of the Netherlands.

The struggle of a small Dutch island against the sea.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A Nesting Doll of Churches.

Hiding the longest subterranean river known in the world.

A musical instrument played by the sea.

Massive series of 45 caves and over 51,000 sculptures carved from cliffsides in China.

A fifth-century temple improbably built into the side of a cliff.