This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

An overlooked memorial honoring the local Washington residents who died in World War I.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

Look closely and you’ll notice that the color changes a third of the way up the tower.

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

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

Daily lunch spot for many of Washington, D.C.'s cab drivers.

This unique museum cafeteria showcases the history and regional diversity of African American cuisine.

This restaurant has been a haven for D.C.'s LGBTQ community since the 1950s.

The fountains of the U.S. Navy Memorial are annually salted with water from the Seven Seas as part of a nautical ritual.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

Before Nixon, "watergate" meant canals.

Art deco landmark on the outskirts of Washington, D.C.

A much-maligned monument to teetotalism.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

Washington's iconic carousel has a nice piece of Civil Rights history.

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

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.