A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

One of the last mosaic tile facades found in the city.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

This fertility idol of questionable authenticity inspired an iconic Indiana Jones artifact.

Surrounded by a verdant garden and a backdrop of ivy, a monument to beloved poet Khalil Gibran stands outside of the Lebanese embassy.

When it comes to handsignals (and colonialism) rock always beats scissors.

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

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

Concerned residents saved this historic house and garden from demolition.

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

This rowhouse doubles as one of the most photographed spots in the nation's capital.

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

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

Hidden within an idyllic suburban garden is a memorial dedicated to the victims of a terrifying spree of killings committed on U.S. soil.

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

A haunting tribute to pioneering photographer Clover Adams.

A memorial to a shareholder activist feared by CEOs around the United States.

This American Civil War-era fort still stands near the border between Washington, D.C. and Maryland.

Obscure Freemasons still live in D.C.’s largest private residence.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

The school tested mustard gas for the U.S. Army during World War I.

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

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