In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

A walk through the historic city center, under the streets of Seattle.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

Eighteen miniature death-scene dioramas.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Not to be confused with the iconic New York City skyscraper, this Chicago building is a vibrant hub for artists.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

A science teacher's dream.

This small Bavarian graveyard is filled with empty graves for German soldiers lost during the World Wars.

Carved fountains poignantly placed in parks and in front of special monuments.

This lurid German fountain plots the sad course of marriage from dating to death.

A striking 12th-century-style castle built on the edge of a cliff.

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

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

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.

The prototype for all Nazi concentration camps.

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

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.