This elaborate towering structure was once famed for its revolutionary height.

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.

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

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.

This taxidermy horse was a Civil War hero.

The most decorated dog of World War I is preserved in the Smithsonian.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

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

At 207 feet, one of the world's longest continuous escalators.

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

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

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

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

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

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

‘Bush the old fire dog died of poison July 5th, 1869. RIP.’

The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.

This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.

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

Sit where JFK proposed to Jackie or where Nixon dined on meatloaf at this storied pub.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.