A cabin completely covered in coffee mugs, where visitors are welcome to leave one of their own—if they can find an empty nail.

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

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

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

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

The beauty of urban decay, hiding some dark secrets.

Healing Springs that once ran red with soldiers' blood.

Tour the sci-fi-esque reality of governmental disease management.

3/4-scale model of the White House in Atlanta, Georgia.

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

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