An Inca spa, military outpost or maybe… both?

Museum housed in underground tunnels that date back to Buenos Aires's earliest settlements.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

This odd Chilean waterfall-cano hotel must be entered via a rope bridge.

Just a few miles from downtown Atlanta is a trail covered in a crazy collection of outsider art.

A self-built castle made by a mysterious man.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

The hallucinogenic center of the ancient world.

One man's ambition created this psychedelic log home.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

Sleep snuggled in a sphere suspended atop the forest canopy of Vancouver Island.

An old world fairytale-land with over 350 fairy folk figurines hidden amongst 800 year old cedars.

A beautiful Victorian-era cemetery, complete with a miniature village.

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

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

The magic's in the hole!

A house filled to the brim with oddities and curiosities.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

A picture-perfect town, perfect for blowing up.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

Costumed elves and mountain bikers co-exist peacefully at this abandoned Christmas-themed adventure park.