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

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

Shop selling 500 flavors of soda has something for everyone.

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

The oldest stone house in Paris was built by its most famous alchemist.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

A hand-built folk art installation covered with messages of God's love.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

One man's homage to the sun continues to grow like a glass fractal.

Resting place of Hollywood's immortals is also site of summer film screenings.

Famously misunderstood wonder of the ancient world

The only theatre in the world constructed specifically for sound movement.

A giant Troll lurks under one of Seattle's oldest bridges.

The United States Capitol's former columns still stand.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

America's most famous piece of self-built architecture.

A kaleidoscopic warehouse-maze of handmade neon signs.

Abandoned railway line circling the city of Paris.

Notorious artist squat renovated into legal studios.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Hidden beneath the streets of London is a secret subway that only carried mail.