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

A three-tiered waterfall plummets from a mountain cave with amazing views over the countryside.

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.

This museum dedicated to an oft-overlooked support industry features a surprisingly moving brass diorama of a man being saved from a sinking car.

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

At 705 feet high, Brazil's "House of Stone" is the largest cave mouth in the world.

A bizarre roadside attraction and the first instance of miniature golf in the world.

The perfectly named cave drop is the deepest in the continental United States, almost matching the height of Seattle’s Space Needle.

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

More than five miles of underground passageways.

Live long and prosper in Tennessee.