An eerie site of reverence for those who have completed an epic journey.

The mysterious 855-foot zigzagging stone wall has been baffling people for centuries.

This "Plant Farm Museum" is home to the divinely inspired and visionary outsider artwork of Reverend Howard Finster.

Incredible miniature towns and buildings created and decorated with thousands of tiny rocks.

Crumbling ruins mark the site of a couple's grisly murder in the woods.

The remains of one of America's first radiation testing grounds still rest ominously in a Georgia forest.

A white oak with property rights.

This mysterious twin turboprop Grumman G-159 covered in graffiti has spent a decade and a half abandoned.

A man's home is his castle.

An abandoned railroad tunnel forgotten by time awaits inquisitive hikers.

This collection of ferns from across the globe is the largest assortment in the United States.

Like Mars, but much closer.

One-of-a-kind museum inside the first Boeing 747-400 ever made.

The beauty of urban decay, hiding some dark secrets.

This "living building" on Georgia Tech's campus is home to a blueberry orchard, honeybees, and more than 900 solar panels.

Suspended above the ground in a thicket of towering Georgia trees is a modern architectural wonder.

Tubing through a cave lit with glowworms is a magical underground experience.

Dive for drinks at Croatia's first and only underwater winery.