A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

Four bald cypress trees in Lafayette Square, across from the White House, mark the southern edge of a 100,000 year old cypress swamp.

A line of blue paint marks the route of the inaugural parade.

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

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

The most accurate timepiece in the world.

A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

People escaping slavery may have hidden inside a corpse vault.

The sculptor was instructed to add “stallion attributes” to the general's bronze mare.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

A surprising, but overlooked example of geology in the middle of the nation’s capital.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

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

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

A derelict bit of transportation infrastructure hidden in the woods.

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

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The United States Capitol's former columns still stand.