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

This abandoned train tunnel has been the subject of countless ghost stories for years.

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

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

This Annapolis home was built by one of the signers of the Declaration of Independence.

This groundbreaking 16th-century map is known as "America's birth certificate."

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

Several times a year, during low tide, two pairs of historic train tracks are revealed on this New Jersey beach.

One of Gettysburg’s least visited battlefield memorials is off the beaten path, but worth a visit.

Just outside the Naval Academy, Hell Point is a historical marker that could easily be the point where failed students wait for the bus.

A winding district gerrymandered into the shape of a mantis.

The only public swimming pool in Baltimore open to Black Americans during segregation is now a permanent memorial art exhibit.

Once a thriving business district, this former shopping area is now an urban ghost town in the heart of the city.

Public opinion is still divided on this enormous sculpture in front of Baltimore's Penn Station.

World War II bunker still standing on the New Jersey beach.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

One of the oldest of its kind.

This shale formation along the Appalachian Trail once inspired the third president of the United States.

Built in the 1850s, this church was of the first five churches constructed in Harper's Ferry.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

Yo, Adrian!

One of the only memorials dedicated to journalists who died in combat.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

In what is rumored to be an intentional act of spite, this memorial almost completely obscures the nearby grave of a senior officer.