The slate extracted from these Pennsylvania quarries was once hailed as the finest in the world.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.

A local prank turned town icon.

An outlandish shoe shaped house built by an eccentric millionaire.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

A toxic ghost town sitting atop a massive coal fire.

Step back in time on this preserved 1800s farm.

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

The secret city built by the Manhattan Project.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

The world's largest set of the ten commandments lay nestled in the heart of the Great Smoky Mountains.

Enormous lake at the bottom of a unique cave system.

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