The medieval network of canals hidden underneath the city is opened to explorers each year.

Mozart's skull may be held in this collection, but definitive proof continues to elude scientists.

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

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

A fearsome dragon clings to a corner of Munich's city hall.

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

The prototype for all Nazi concentration camps.

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

A small but immensely extravagant palace built by the "Night King."

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

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

A 12th-century fortress containing some of Berlin's oldest buildings.

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

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

Art and a pun, all in one.

This unusual lava tube spouts seawater during high surf.

A recreated Stonehenge stands in a country field, complete with Easter Island moai heads standing as sentries.