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

Elvis's own personal tropical hideaway.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

A collection of huge Pre-Colombian structures in Alabama.

Auburn's iconic eagle flight goes back to a 19th century eagle that dropped dead on the field after inspiring the football team to victory.

A propulsion engine testbed that paved the way for the Space Shuttle launch sits without recognition at this rocket center.

A second generation sun-powered marvel lights up the night.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

Less a museum than a bizarre fantasy world created by artists and engineers.

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

One person's lost luggage is another person's treasure.

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

This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

A 35-foot-tall fork stuck in the ground outside an office building in Missouri.

An unexpected but incredible collection of wildlife dioramas spanning rainforests, swamps, forests, and plains.