Believed to be haunted, this old cemetery is beautifully adorned with Spanish moss hanging from the trees.

This small beachside park commemorates the possibilities of discovery.

The birthplace of the Herndon Gas Company.

This fertility idol of questionable authenticity inspired an iconic Indiana Jones artifact.

Concerned residents saved this historic house and garden from demolition.

The historic home of an educator, abolitionist, activist, and poet.

The last remaining building in Washington, D.C., built by H.H. Richardson, one of America's most iconic architects.

Coins and medals straight from the mint await visitors to this shop in the nation's capital.

An obscure federal monument honors the French diplomat who served as Ambassador to the U.S. during WWI.

Daily lunch spot for many of Washington, D.C.'s cab drivers.

A diminutive plaque recalls the treetop sniper who almost killed Abe Lincoln.

A celebrity from the late Cretaceous period.

There's a crumbling old mansion inside the Smithsonian National Zoo.

This leafy estate is worth $18 million and is so grand it has two mailing addresses.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

This former factory has been transformed into a technicolor wonderland, where dozens of local artists have collaborated to create a real choose-your-own-adventure experience.

From printing money to live music, this Beaux-Arts style building has had many identities over the last century.

You’ll feel like you’ve gone through the looking glass at this contemporary art museum filled with glass sculptures of every size, shape, and color.

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

A unique marker erected during the 18th century.

Once a sewer culvert, this road tunnel now offers cyclists and pedestrians a subterranean stroll under the C&O Canal.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

This peaceful Massachusetts graveyard was one of the first "garden-style" cemeteries in America.