The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

A toxic ghost town sitting atop a massive coal fire.

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

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

The Cadillac Ranch for monster truck aficionados.

One of the best places to see feral Colonial Spanish Mustangs in the United States.

Beautiful Gothic-inspired lighthouse stands out among the run-of-the-mill striped fare on Bodies Island.

A glimpse into the sacrifices of military members during World War II.

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

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

This pre-Revolutionary War grist mill ground corn and flour for soldiers in seven American wars.

A small Richmond island dotted with the remnants of hundreds of years of history.

Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

Affectionately known as "Lord Bot," this historic statue has a cult social media following and rightly claims to be “the most metal inhabitant of the Wren Yard.”

America's first public mental health facility.

Scenic mount trashmore, Virginia Beach's most curious waterfront still has a couple of secrets.

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

A desiccated merman and a walrus penis bone are among the oddities in this eclectic collection of shipwreck treasures.

The land is home to swimming ponies and a legendary 18th-century treasure.

This boulder stays on its mountain thanks to a huge chain and on the map due to local legend.

Kentucky, Tennessee, and Virginia meet at this point in the Cumberland Gap.

Country fans may flock to Nashville's music scene, but this Appalachian town is where the genre was born.

One street divides a single town that stands in two U.S. states.

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.