The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

This statue of the great Argentinian car driver is located near a famous curve of the Monaco Grand Prix.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

This unusual lava tube spouts seawater during high surf.

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.

An historic, one-lane, pedestrian suspension bridge on Kauai.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

Once the site of the Hawaiian monarchy, this building was originally designed as a palace.

This historic stone bridge has an entire neighborhood clinging to its sides.

The largest mosque in Germany.

Climb inside an iron crystal magnified 165 billion times its normal size.

These delicate sand pyramids look like naturally occurring gothic spires.

A massive sea stack famous for its appearance in The Goonies.

This massive redwood tree has a hole in the base big enough to drive through.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

An ancient capital city that dates back 3,000 years and harbors many surprises.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.