A historic cemetery with unique artwork, a Civil War fort, and also happens to be the site of the Battle of Bladensburg.

This grove was planted more than a century ago by the War Mothers of World War I.

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

This advertisement for talcum powder was painted on the rock face and has since defied removal.

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

The ruins of an 18th-century mansion that was once named "Mistake" by the man who had it built.

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.

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

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

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

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

A historic cemetery filled with quirky faux wood art and unique tombstones.

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

Once a thriving business district, this former shopping area is now an urban ghost town in the heart of the city.

A lawn full of retired spacecraft on display at one of NASA's first research labs.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

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

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

This beautiful stone arch bridge wasn't even expected to stand for one day, but people have been crossing it for centuries.

A remarkable time capsule of American manufacturing deep in Maryland coal country.

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

This abandoned sea fort has become an accidental bird sanctuary.

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