This tribute to the 16th-century composer is now an unusual shrine to Michael Jackson.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

Some people believe that this makeshift space monitoring station received transmissions from clandestine cosmonauts.

A Turkish ghost town abandoned in a population exchange with Greece.

This charming fountain honors Felix Salten, the creator of the iconic storybook deer.

The Swiss artist's bulbous and overgrown shape-shifting sculpture controversially graces the center of Bern.

Extensive private collection of authentic Medieval devices used for human torture and execution.

This colorful but controversial ceiling has been likened to a 21st-century Sistine Chapel.

See the rare bloom of the "Queen of the Night" cactus at one of the world's largest succulent collections.

Walk through a restaurant's refrigerator door to reach this hidden bar.

For centuries no one knew there were hundreds of bones and precious artwork hidden beneath this Swiss church.

This amazing pedestrian suspension bridge in the Swiss Alps would give Indiana Jones nightmares.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

The largest Neolithic ruins in the world hide a notably clean prehistoric metropolis.

Flames have been burning within this mountain for more than 2,500 years.

Once described as the "Eagle's Nest," this ruined ancient city rests on a remote mountaintop.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

Hidden just under the waters around this Turkish island are the ruins of a once great city.

An abused and forgotten metropolis, abandoned for centuries.

A deadly ancient portal to the underworld.

A Lycian city of the dead carved into the hillside of Southern Turkey, complete with startlingly human touches.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

A marvel of Byzantine engineering under the streets of Istanbul.

Roman ruins top white travertine terraces formed by ancient hot springs.