A toxic ghost town sitting atop a massive coal fire.

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

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

Memorializing an American tragedy of massive proportions.

When the Austin Dam failed it destroyed much of Austin...and then it failed again.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

An abandoned stretch of highway, deteriorating next to the operational one.

A hidden piece of Altoona's railroad history in a long-forgotten abandoned town.

This dramatic rail curve was once the target of a failed Nazi attack.

Behold the rickety wooden glory of the world's oldest operating roller coaster.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.