Spectacular mineral formations fill these caves, which have been used for everything from smoking meat to stashing illicit liquor.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

Scenic mount trashmore, Virginia Beach's most curious waterfront still has a couple of secrets.

It's 2 billion years old!

Paranormal activity on the great lakes.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

Home of a 28-foot tall stalagmite known as the War Club.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

This cavernous abandoned marble mine is popular with ice skaters in the winter.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

An eccentric company offers eccentric millionaires the opportunity to have spaceflight-related experiences.

This amazing ancient cave was kept secret for seven years to protect it from the public.

Legends of treasure and spirits flow from this this fairy tale-like oasis.

The remains of an abandoned dinosaur theme park litter the woods just off the highway.

Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.

Why have you never heard of the second most popular tourist site in New York?

The once great capital of Egypt now crumbles forward as evocative ruins.

A countryside Romanian cemetery filled with colorful crosses bearing lyrical, ironic, or satirical rhymes.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

England's most notorious suicide spot.

Rebuilt remains of a temple to Roman god Mithras.

The world's first experimental nutritionist is memorialized as the "Hippocrates of naval medicine."

Glasgow’s piece of the patron saint of love.

Colorful boxes placed over the dead are left to rot and crumble.