A former copper mine which became a truly unsuccessful prison.

What was once a unique system of urban elevators is turning into a mechanical ruin.

Once one of the largest producers of pig iron in the world.

A crumbling Beaux Arts monument to the Bay Area's age of rail.

Bangkok celebrated its shifting monarchy with a militaristic homage to democracy.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

The rusting remains of the largest assembled WWII fleet on the West Coast.

Sweden's "good old days" painstakingly re-created in a model village.

It houses the remains of a 17th-century version of the Titanic.

18th century opera in its original splendor.

Home to three historic ships from the age of Vikings.

Ancient burial grounds of the wealthy.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

Copenhagen's celebrated theme park and gardens.

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

One of the world's largest model railroads is a mind-boggling achievement.

A museum designed by and dedicated to P.T. Barnum in the town where he is buried.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

The railroad tunnel nicknamed the "Bloody Pit" for taking the lives of hundreds during its construction.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

The world's oldest and largest museum of mass transit vehicles.

A valley of unique erosion patterns lends to a view like nothing on Earth.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.