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.

This abandoned Victorian-style house was built in 1884.

The whole world in one water tank.

The U.S. government built the million-pound stack of steel during the Space Race.

This golfball sized platinum iridium cylinder is the official starting point for all national weight calibrations

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

Three abandoned missile silos are hiding in plain sight behind a suburban development in Maryland.

The oldest surviving one-room schoolhouse in Montgomery County, Maryland.

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

The rooster who crossed the road lives on forever in Takoma Park, Maryland.

A benevolent, 16-foot-tall river dragon lives on a suburban lawn.

A tribute to the beloved, kind-hearted "homeless mayor" of Silver Spring.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

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

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

An allegorical sculpture in Maryland wears the artist’s politics on its trunk.

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.

One of the largest collections of Catalan literature and cultural materials outside of Spain, created by a community of 1960s expats.

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

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.