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

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

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

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

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

An artsy hidden staircase leads to breathtaking views of San Francisco.

On Japan's Tashirojima Island, cats are king.

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

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

A terrific purveyor of natural history objects and curios.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

A huge musical instrument played by the ocean.

In Coyoacán, a pair of coyotes crown a public fountain in reference to the ancient Aztec name of the borough.

A small pack of an ancient, hairless breed of dog once believed to guide souls through the underworld lives on its grounds.

Iconic red and white plaques show the creative names invented to navigate the city streets.

A mysterious pillar in an ancient burial chamber is said to predict how long you have to live.

Southern Mexico under the influence of mushrooms, ceremony and celebrity.

Where layer cakes tower above one’s head and there is never a shortage of icing.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

A flooded Mexican cave that hides a river beneath the water.

The winter home of millions of migrating monarch butterflies.

The famous artist couple lived and worked here, in two different houses separated by a bridge.

The largest cave shaft in the world is home to thousands of birds and popular with BASE jumpers.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.