This former Cold War missile control site played an important role in the creation of GPS.

An out-of-place Air Force radar dome is all that denotes this park as a former missile launch site.

Dogs, cats, horses, monkeys, frogs, and fish are laid to rest at the second-oldest pet cemetery in the U.S.

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

The largest cemetery for enslaved people in Loudoun County was almost lost to history, if not for the research of a minister.

Bizarre Cavern.

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

A sweet tribute to Georgia's official state vegetable, which even has its own mascot: "Yumion."

Jacksonville's highways rendered this century-old grammar school unusable.

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

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

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

An abandoned village that doubled as "The Hunger Games"' post-apocalyptic wasteland is up for grabs.

A lawn full of retired spacecraft on display at one of NASA's first research labs.

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

Located at the former Lorton Prison the Lucy Burns Museum tells the story of the 91 year history of the prison including the dark chapter of its involvement in the women's suffrage movement.

Eighteen miniature death-scene dioramas.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

Tiny observatory made big contributions to the study of the Earth's motion.

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.

People escaping slavery may have hidden inside a corpse vault.