The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

Pittsburgh's literal underground railroad.

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

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

Outsider art meets paleontology at this roadside reptile repository.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

Pennsylvania's highest point is spotted with boulders which were pushed to the surface by nothing but cold.

The largest burial mound in the United States holds the remains of prehistoric West Virginians.

One of the last active volcanoes on the Eastern seaboard.

The only recreation of William Shakespeare's indoor playhouse.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Exact replica of the ancient monument, but much, much lighter.

The highest point in Maryland is only accessible by hiking through another state.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

A table rock formation that has been intriguing West Virginians for years.

Near-constant high winds deform the trees on Spruce Knob, the highest point in West Virginia.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

Home of the International Space Hall of Fame.

A museum dedicated to the alleged Roswell Incident.

The world's first commercial spaceport is a disappointment of cosmic proportions.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.