The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

Artistic tombs, monuments, and a beautiful "Hall of Fame" lurk inside this cemetery.

The secret medieval communication system will whisk your words above the noise of the crowd.

A larger-than-life house of cards stands outside the house of a former fashion designer.

Inside this park resides a giant clock tower and ancient sundial that overlook the town below.

A perfectly preserved example of a fortified Medieval ricetto.

A 12th-century Italian skirmish gets reenacted with 500,000 pounds of flying citrus.

Over 100 artworks are painted on the walls of this town, making it an open-air museum of contemporary art.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

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

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

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

Hear the quietest sound from across the dome.

This 1920s Dutch barge is now a floating bookstore.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

The curios of pharmacist and collector Henry Wellcome.

Eighty million natural history specimens call this gargantuan museum home.

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

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

A kaleidoscopic warehouse-maze of handmade neon signs.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

This basement museum explores the art and artistry of fascism.