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

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

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

An ear-piercing buzzer calls lawmakers to a vote with a series of long and short rings to form coded messages.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The "lovely red Vega" of the legendary record-settling pilot.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

The oldest continuously operating fish market in the United States.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

A historic ruin just 20 feet away from a busy highway onramp.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.

A derelict bit of transportation infrastructure hidden in the woods.

This forgotten boat elevator was an engineering marvel in its heyday.

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

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

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

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

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

FDR's Art Deco hospital tower was hopelessly inefficient.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.