A geological wonder shrouded in myth.

This 200-meter-high waterfall marks the site of Achilles’s immortal baptism at the mouth of the River Styx.

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

This vertical pinnacle in China was the inspiration for the floating mountains in the movie “Avatar.”

All that's left of the quintessential "cabin in the woods."

Cold War missile launch site which has been converted to a public park.

People escaping slavery passed through the oldest house in Lombard, Illinois on their northbound journey to freedom.

Once a speakeasy operated by Al Capone, this Milwaukee cigar bar is now a haven for ghost hunters.

A historic, reportedly haunted pub that provided inspiration for several famous adventure novels.

Shop of curiosities with a dinosaur museum tucked in its basement.

A century-old network of freight tunnels underneath the city's historic business district.

Landmark Chicago building narrowly avoided destruction.

Chicago's largest cemetery is full of beautiful Victorian monuments and more than a few ghost stories.

A lush green oasis in the middle of Chicago.

Medical museum focused on antique anesthesiology equipment.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Meant to be one of the most extravagant hotels in the world, now an eerie, abandoned architectural gem in Mexico City.

Twelve natural mummies are displayed in the crypt of this former monastery school.

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

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

Part bookstore, part café, and part forest.

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

Burial mounds of prehistoric Native Americans who lived along the DuPage River.