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

The world's oldest soul food restaurant is also one of its best.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

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

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

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

A celebrity from the late Cretaceous period.

A super-sized promotional trick that is now a D.C. landmark.

Home to a vast and influential collection of Shakespeareana.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

This grand gothic brewery has been pumping out suds for over a hundred years.

A wondrous old library overlooking the nation's capital.

A historic neighborhood church is reborn as a psychedelic arts collective.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

Overlooking Puget Sound sits a garden with a Buddhist prayer wheel and an elaborate labyrinth.

Mysterious ancient petroglyphs carved on a glacial boulder at the tip of Bainbridge Island.

This monument remembers the first Japanese Americans forcibly relocated during World War II.

This star-studded Old Hollywood restaurant is where fettuccine Alfredo made its United States debut.