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

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

The ruins of this long-abandoned unsuccessful gold mine can still be found.

Proto-CIA agents trained with grenades in the sand traps and fired machine guns from the fairways.

One of the oldest standing structures in Montgomery County, Maryland.

This massive swimming pool is the high tech home to the human-powered submarine races.

This propitious plastic porcine has been petitioning park visitors to pick up after themselves for more than 50 years.

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

This bell is one of the last remnants of the lost city of Triadelphia.

This general store has stood in the same spot for well over a century.

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

A suburban museum tells the story of a historic transportation network and even provides rides in antique trolley cars.

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

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

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

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

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

An astounding collection of medical specimens, including bits of President Lincoln.

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

The wooded estate of the Forest Service employee responsible for D.C.’s cherry blossom trees.

This mighty white oak in Bethesda survived both the American Revolution and the construction of Washington D.C.'s metro red line.

FDR's Art Deco hospital tower was hopelessly inefficient.

She stares out across six lanes of traffic, clutching a musket and infant with determination.

This suburban house is made of dirt, and almost sparked a revolution in home construction.