Hear the quietest sound from across the dome.

One part local history, 99 parts gruesome haunted house.

Eighty million natural history specimens call this gargantuan museum home.

Banksy gives themself artistic license with this piece of London street art.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

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

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

The most visited, and possibly most controversial, museum in Germany.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

The Last Home of an Executed King.

This ruined folly was originally built to honor a failed American state that would have become "Westsylvania."

This foolish Victorian sea fort was converted to a deluxe hotel.

This colossal war machine is now a living museum dedicated to underwater warfare.

Discovered on a shipwreck after more than 400 years, this Renaissance ratter tells a very waggly tale.

This striking observation tower shaped like a spinnaker sail is the newest icon in historic Portsmouth.

Hauled from the water's depths, Henry VIII's flagship is preserved in this capsule-shaped museum.

This beautifully verdant lagoon is tucked below a massive volcano in a crater atop a black pebble beach.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

Ancient mysterious ruts carved in the bedrock.

The largest greenhouse in the world is home to over one million types of plants.

Sometimes an island, sometimes a rocky outcropping connected to the world by a tiny suspension bridge.