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

Metro station with a claim to rock n' roll fame.

The only gulag ever to exist in socialist Yugoslavia.

One of the most horrible legacies of the Cold War is a site where the Soviet Union tested nuclear bombs on civilians.

A Cold War command center is hidden under an idyllic countryside.

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

Launch site for nuclear war against Western Europe.

The lost American era of gunfighters, bandits, Indians and steam trains is recreated in Sweden.

The secret cells in the basement of the KGB's Estonian "Grey House" have been preserved as a grim Cold War museum.

This cramped crevasse saw the entire population of its island suffocated inside its depths.

An ancient monastery, a locked room, and a mysterious book heist.

The deepest hole drilled in the name of science, where evidence of Precambrian life was found.

This one-room museum is dedicated to Norwegian history and jokes.

This lake-bound geographical marker sits at the point where three European countries intersect.

Walk 2,300 feet above the ground on the "Troll's Tongue."

These warring psychedelic crags commemorate an unsuccessful military operation.

Site of the largest impact event to occur over land in Earth's recorded history.