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

A star fort along the C&O Canal in western Maryland that protected America in three wars.

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

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

An astounding collection of medical specimens, including bits of President Lincoln.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

An eerie, decaying ghost town destined to fade into the forest.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

This North Carolina grave is the final resting place of the world's most famous conjoined twins.

This abandoned school has had many lives since the early 1900s, and all of them doomed.

Hikers can still stroll beneath the long conveyer of this abandoned mining facility hidden in a West Virginia river gorge.

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

This abandoned amusement park was built on a site with a dark history.

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

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

The ruins of this long-abandoned unsuccessful gold mine can still be found.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.