A huge musical instrument played by the ocean.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

A battle between nature and architecture in the Cambodian jungle.

The world's longest known cave system.

A bizarre house filled with an astounding array of collections.

See massive fossils that are over 200 million years old in northeastern Arizona.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

World's first "penitentiary," meant to be humane, drove men insane.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.