The Decoy Capital of the World.

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.

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

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

An eerie, abandoned military base engulfed by nature and graffiti is now home to a local park.

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

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

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

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

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.

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

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

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

One of the only memorials dedicated to journalists who died in combat.

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

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

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

The world's oldest continuously operating airport was founded by the Wright Brothers.

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

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

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.