These disused steel furnaces are now haunting ruins that may one day be a national park.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

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

A quiet, gothic haven nestled between Pittsburgh's Squirrel Hill and Point Breeze neighborhoods.

A gravestone marks where a man's lost limb was laid to rest.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

A toxic ghost town sitting atop a massive coal fire.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

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

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

A portion of the old Pirates stadium over which a defining home run once flew still stands even after the rest of the stadium was torn down.

This public park was the site of the largest civilian disaster of the Civil War.

There aren't too many operational funiculars around, but Pittsburgh has two!

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

Despite being stolen multiple times, this civic electrician's street corner Snoopy won't be stopped.

Pluto is still considered a planet in Ithaca, New York.

World's largest herd of white deer populate a former U.S. Army depot.