This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

This former asylum for Black Americans is haunted by its history of violence and racism.

A faded sign from the 1920s remembers Baltimore's resistance toward banning alcohol.

Built by the patriotic residents of Boonsboro in a single day.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

A Civil War Museum with some notable medical antiques.

The 320-year-old tree that greeted General Lafayette and rerouted an interstate highway.

Ship skeletons haunt Baltimore's waterways.

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

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

After hundreds of years of settlement, this once-bustling fishing village sunk into the Chesapeake Bay.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

Walk a trail through a historic Quaker town that outlawed slavery in 1777 and was a major waypoint on the Underground Railroad.

An FDR-era tuberculosis sanatorium has stood abandoned in the suburbs of the U.S. capital for over 30 years.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

A hidden alley in urban Baltimore is a haven for graffiti artists.

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

A blank headstone topped with a pile of pennies marks the final resting place of the infamous assassin.

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

A local farm's collection of unusual structures from a now defunct storybook amusement park.

Fiji mermaids, mummified remains, and recreated cryptids are among the morbid oddities at this Maryland museum.