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

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

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

After a nearly successful attempt on Hitler's life, the conspirators met their fate in the courtyard of this Berlin building.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

Cold war icon and onetime "hole" in the iron curtain.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

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

The silly symbol for an underground protest group is now scattered around the city.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

Gliwice Radio Tower, likely the tallest wooden structure in the world.

An underground city of salt.

The unsettling remnants of a torn down movie set lies nearby the ruined location of the actual Płaszów Labor Camp.

Real bones which are said to have belonged to a Polish dragon.

This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.

Hidden away in the city of Madison, Wisconsin is a nearly forgotten home that Frank Lloyd Wright built for a childhood friend.

Enjoy an overnight at an old haunted B&B site of the Borden family murders.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

340-foot statue built to honour the Heroes of the Soviet Union.

A castle perched precariously over the Crimean Sea.

This space age health spa looks like a supervillain's lair.

In the land of the Light Brigade stands a testament to the Cold War.

The deepest metro station in the world.