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

The prototype for all Nazi concentration camps.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

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 fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

It's good luck to be mocked by this monkey.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

A preserved college lock-up that recalls a clubhouse approach to discipline.

An unlikely beach paradise of giant sand dunes lies between two lakes just a few minutes from Michigan's cherry country.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.

Stare out over the lagoon and beyond from this 10th-century campanile on the island where the city of Venice began.

Abbey built on the ruins of Roman catacombs.

Medieval irrigation channels built into the sides of mountains provided Valais with water for hundreds of years.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Largest necropolis in the Mediterranean.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.