Huge winged monument in the United Kingdom.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

As the Dead Sea continues to deplete, massive sinkholes open along its banks.

The real life town from the Pied Piper of Hamelin has a mechanical puppet show that retells the famous story many times a day.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

A building so large that it has its own weather.

San Francisco's oldest operating hotel, with a Victorian atmosphere and a "haunted" fourth floor.

In Egypt's expanding metro area, many of the neighbors are dead.

Lava stone structures possibly dating back to the 19th century may have been a stopping point for voyagers between ancient Egypt and the Mayan Civilization.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

This elaborate temple was built around one of the Buddha's teeth.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

Semi-precious Blue John stones have been mined in this cavern system for centuries.

Temple complex that once housed the famous statue of Nike.

This bridge is the first to be made entirely from iron, but designed like it was still made of wood.

This logic-defying 16th-century Tudor manor still stands to the delight and astonishment of onlookers.

The largest oak in England is said to have been the hideout of Robin Hood and his Merry Men.

6000-year-old site covered in more than 50 megaliths.

A brick foundation and piles of listing building materials are all that remains of this World War II POW camp.

Seat of the Duke and Duchess of Devonshire for centuries.

A preserved 18th century steel factory.

When methane gas started seeping up from the ground, they picked up and moved the entire town.