The national park was once a plantation estate.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

An overlooked memorial honoring the local Washington residents who died in World War I.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

A computer bug so primitive it was an actual insect.

Seemingly unremarkable items like empty sushi trays, chef hats, and freshness stickers are being preserved so future generations can look back on this beloved cultural import.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

Go take a picture with the inventor of the daguerreotype photographic process.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

A mammoth pair of Civil War artillery guns abandoned out in the forest.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

A historic cemetery filled with quirky faux wood art and unique tombstones.

This 1830s store is believed to be the site of Harriet Tubman's first stand.

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

Politicians, bureaucrats, and military officers gathered in this field near the Capitol to settle their disputes with blood.

A historic cemetery with unique artwork, a Civil War fort, and also happens to be the site of the Battle of Bladensburg.

The development and impact of electronic media showcased in a picturesque farmhouse in Maryland.

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

The Forest Service's surprisingly sophisticated collection of wildfire prevention art features America's most beloved bear.

Two dozen pinball games hidden away inside a most unlikely location.

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

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

Electronic inventions that resulted in products and systems we use every day are on display in this labor-of-love museum.

The likeness of the Baltimore music icon was unveiled in time for the anniversary of his Senate hearings on music censorship.