Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

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

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

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

Mai Tais and Navy Grog served up in one of the original tiki bars.

The ruins of a cotton mill that was burned in the Civil War are still hidden in a Georgia forest.

This historic train station has been converted to a locomotive themed hotel.

The last bastion of Roman presence north of the Alps looms over a German town.

What else would you call a playground hidden in Alabama's oldest and largest cemetery?

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

Bananas are often left for the first monkey America ever recovered alive after being launched into space.

Florida's oldest bar was once a morgue, complete with a hanging tree and gravestones.

Send a postcard while vacationing with Satan.

This popular tourist cave was ignored for almost 200 years before being mined into an attraction.

This angular brutalist playground turns playtime into modern art time.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

Intertwined, interspecies trees which locals believe can grant boons to lovers.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

A mysterious castle built as a monument to lost love.

A monument celebrating the idea of reaching inaccessible places.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A fitting attraction for the corn capital of the world.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.