A national collection of Communist-era musical posters.

A hidden art gallery in an abandoned Warsaw fort.

A statue honors the children who fought Nazis in Poland.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

A 20th-century picture show in 3-D.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

Cat art as far as the eye can see.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

Just a few miles from downtown Atlanta is a trail covered in a crazy collection of outsider art.

Underneath this small church are 15,000 bones, arranged by an obsessive academic.

A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.

Walk through a fairytale in Tuscany.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

A son-and-daughter meat market, hawked by mom and dad.

Thousands of locks professing undying devotion line the metal chains of Lotus Peak.

The largest dinosaurs in the world, kissing above the highway.

Jurassic theme park in the small town of Erlian.

Massive series of 45 caves and over 51,000 sculptures carved from cliffsides in China.

This working replica of the 'Friends' coffee shop is more accurate to the show than the set itself.

The world's longest outdoor escalator takes visitors to the top of China's largest dam and is also shaped like a dragon.

For those with no fear of heights: a skywalk 4,700 feet up on a Chinese mountain.