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

Meet some of the most prominent figures in Black history through life-sized wax models.

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

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

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.

The design of this historic domed church was influenced by Thomas Jefferson and intended as a statement of religious freedom.

Once America's tallest structure, now a Baltimore landmark.

Remains of a historic fountain that was mysteriously lost in the demolition of a D.C. traffic circle.

A labor of love built by local hang-gliding enthusiasts, this ideal launch spot was outlawed by the authorities and has since been largely abandoned.

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

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

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

Brain collection and database that narrows the gap between man and animal.

This simple convenience store sits on the location where the Ouija board was named—and has a plaque to prove it.

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

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.

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

A Civil War Museum with some notable medical antiques.

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

The final resting place of the tragic king and queen of the Jazz Age is tucked away in a small Maryland graveyard.

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

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