One of downtown Berlin's last reminders of its Communist past.

A restaurant and observation deck built in a unique broadcasting antenna.

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

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

The most visited, and possibly most controversial, museum in Germany.

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

The prototype for all Nazi concentration camps.

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

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

Baroque celebration of the end of the Great Plague of Vienna.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

The final resting place for the remains of 143 Habsburg royalty.

Southern Italy's spinning top village.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

An Italian hillside ghost town.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

A mushroom-shaped outcropping that has come to be the symbol for an entire town.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

An open-air museum in a mountain valley features works designed to blend in with—and disintegrate back into—their natural surroundings.

Island wonderland for communist autocrats.

The "dragon babies" of southeastern Europe.