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

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

The only public school for Black children in the region from 1895-1936.

The ruins of an old mill lie in a small ravine along a hiking trail near Little Seneca Creek.

Hidden within an idyllic suburban garden is a memorial dedicated to the victims of a terrifying spree of killings committed on U.S. soil.

Built in 1815, the stabilized ruins of the grist mill and sawmill are now gated, but interpretive displays on the features and functions of the mill preserve its history.

The hidden ruins of a mill that is linked to an attempt to assassinate the vice president of the United States.

The headquarters of the Audubon Naturalist Society is a small slice of heaven for nature lovers.

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

This ruined quarry once produced the distinctive red sandstone used for construction projects in Washington, D.C.

The whole world in one water tank.

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

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

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

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

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

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

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

Look closely and you’ll notice that the color changes a third of the way up the tower.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

Washington's iconic carousel has a nice piece of Civil Rights history.