This isn't your average roadway—it's actually a National Park and a transportation pioneer.

A small token of gratitude from freezing cold journalists who were given a warm haven while covering JFK's inauguration.

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

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

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

The naval commander’s proudest moment in battle is memorialized in this unique tomb at Arlington Cemetery.

The rogue roots are gradually consuming some of the historic marble grave markers.

Recorded as the first person buried in Arlington Cemetery.

Born a slave on the Arlington estate, Parks dug the first graves at Arlington National Cemetery, and was buried there, too.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

Though his role as the inventor of baseball may be up for debate, fans still festoon Doubleday's grave with baseballs.

A gift from Scotland to the United States in memory of the 270 lives lost when Pan Am Flight 103 exploded over Lockerbie due to a terrorist bombing.

In what is rumored to be an intentional act of spite, this memorial almost completely obscures the nearby grave of a senior officer.

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

Politicians, bureaucrats, and military officers gathered in this field near the Capitol to settle their disputes with blood.

A haunting tribute to pioneering photographer Clover Adams.

The homestead of American patriot John Adams.

The nation's second-ever First Lady urged the founding fathers to "remember the ladies."

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

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

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

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.