Macabre astrological automaton clock dating to the late 1400s.

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Eighty million natural history specimens call this gargantuan museum home.

A tongue-in-cheek arcade where the games are based on everyday life.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.

A war-torn Olympic relic is being overtaken by graffiti and nature.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

This curious sculpture represents the perseverance needed to take to the skies.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

Where once there was a train station bathroom, there is now this German burger joint.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.

Bridge that died in war and was resurected.

The bluer than blue waters in these natural Israeli caves are reached via the world's steepest cable car.

Tiny memorials honor individual victims of the Holocaust.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

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

An old department store turned Nazi prison turned artist commune.

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.