A winding district gerrymandered into the shape of a mantis.

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

The United States' oldest Episcopal church still in active use.

This four-story steel sphere in Maryland was used to test biological weapons.

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

An isolated island home to one of the oldest English-speaking communities in the region and Maryland's state dessert.

FDR's Art Deco hospital tower was hopelessly inefficient.

This 1830s store is believed to be the site of Harriet Tubman's first stand.

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

The elevator hidden in a smokestack on Roosevelt's yacht now serves as a monument to the former president.

Wedged between two sets of row houses is an awkwardly located family graveyard.

A swimming hole in the historic industrial quarry that supplied the marble for the Baltimore Washington Monument.

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

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

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

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

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

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

This 16-foot, intricately detailed model of the Gearing-class destroyer has been called the most detailed model ship ever built.

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

A relic of FDR's brief foray into utopian urban planning.

America's first nuclear-powered merchant ship is now a time warp to the atomic age.

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

Home of the physician who set the leg of John Wilkes Booth after the Lincoln assassination.