A former major munitions plant that has been converted into a sprawling art space.

The narrowest house in America is seven feet of pure spite.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

A castle built for love, and abandoned due to heartbreak.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Arrr! The most authentic collection of pirate artifacts in the world... matey.

A public fountain that spouts "health water" from a nearby spring.

FDR's Art Deco hospital tower was hopelessly inefficient.

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

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

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

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

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

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

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

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

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

The whole world in one water tank.

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

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

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.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.