The world's second-largest excavated hole.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

When you get to Magnetic Hill park near the sign, put your vehicle in neutral gear, and watch it roll uphill...

Curious crater remnants in the middle of the Australian outback.

This beautiful "lagoon" is actually a toxic soup filled with cars, carcasses, and trash. When warnings couldn't stop people from going for a dip, the town dyed it black.

The center of the only hemisphere that awards visitors with a commemorative coin.

Historic psychiatric asylum and most-filmed location in the Great White North.

A world-class observatory in the California desert.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

A nursery specializing in strange and beautiful succulents and cacti.

The "3rd largest" city in California is an empty mirage of suburbia in the middle of nowhere.

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

University of New Hampshire holds the documentation and artifacts of local alien abductees.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

A Gothic cathedral created from volcanic rocks.

The only castle in North America to ever house European sovereigns.

A National Historic Landmark with a scenic clock tower and park filled with deer and peacocks, plus a military museum.

Mysterious glowing orbs float through the desert night.

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

Frida Kahlo's childhood home, now a museum of her life and works.

66,000 pieces of art, donated by one of the world's richest men.

This fantastical house shaped like a seashell brings aquatic design to architecture.