Conjoined twins Daisy and Violet Hilton were stars of the vaudeville circuit.

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

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

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

The early data processor factory founded in Washington for the 1890 U.S. Census went on to become IBM.

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

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

Before Nixon, "watergate" meant canals.

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

Disks are rolled out onto the south lawn to absorb the impact of Marine One's wheels like giant coffee coasters.

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.

The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.

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

Beneath unsuspecting visitors feet, a capsule containing pieces of America’s civil rights history.

The National Park Service’s best-kept secret with views that rival any in D.C.

After his presidency, George Washington planned to live only a few blocks from the Capitol building.

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

There just so happens to be a court even higher than the U.S Supreme Court: a basketball court in the building itself.

"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 actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The "lovely red Vega" of the legendary record-settling pilot.

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