The prototype for all Nazi concentration camps.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

The footprint of a frustrated devil in Munich's Cathedral.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Italy's "New Mountain" rose from the ground in a volcanic eruption in 1538.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

2300-year-old Roman road connecting the empire.

Stone Age solar temple is aligned with the sun on each equinox and solstice.

Pompeii's less famous neighbor is still revealing her secrets.

Erotic art covers the walls of the largest ancient pleasure palace.

The glowing blue Nymphaeum of Emperor Tiberius.

The Emperor Tiberius' palace of debauchery.

Italian cave with exceptional acoustics and an unsavory history.

This entire town moved to a safe location after it was devastated by an earthquake, but the remains of the original town are still around.

The world's most active stratovolcano is almost always erupting.

Thousands of well-dressed mummies below a monastery.

142 ceramic steps become a mosaic once a year.

A controversial memorial at the place where Captain Cook met his violent end.

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

An authentic replica of an Asian temple and garden hidden amongst the natural beauty of Hawai'i.