Underneath a chalk hill in France lies what Hitler hoped would be the underground launching base for a devastating new weapon.

A man's home is his castle.

This ever-changing arrangement of naked dolls even caught the attention of "The Walking Dead" crew.

This labyrinth was designed to help visitors focus and meditate.

Tombstone of a dog that greeted passengers at the Southern Railway Depot.

Follow the steps, and this roadside artwork will teach you how to dance.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

A historic gristmill that still produces flour and grits the old-fashioned way.

Could this grave be the true resting place of legendary gunfighter "Doc" Holliday? Unclear.

This lovely burial mound is actually a replica that was installed after archeologists excavated the original.

A museum and doll store featuring a surreal and super sanitized version of where babies come from.

Georgia's highest point was given its strange name thanks to a simple translation error.

These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

World's largest college campus includes a wildlife sanctuary and a former movie set on more than 28,000 acres.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

A rotting air force base is now home to rare birds and scarce plants.

A colorful square marks the heart of the city's LGBTQ community.

An underground magnet for ever-changing street art.

Like Mars, but much closer.

A white oak with property rights.

A stockpile of childhood lunch pails turned collectibles.

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