Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

A spectacular tribute to statesman and philanthropist Andrew Mellon.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

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

A rare example of a rural school in Washington, D.C.

The house where John Wilkes Booth conspired with his co-conspirators.

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

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

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

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

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The Conduit Road Schoolhouse is one of the last one-room schoolhouses remaining in Washington, D.C.

One of the last mosaic tile facades found in the city.

Go take a picture with the inventor of the daguerreotype photographic process.

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

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

The first presidential bomb shelter was located in an old vault under the Treasury, connected to the White House via tunnel.

Helen Keller once broke ground on this historic center for the study of technologies to benefit the hearing impaired.

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

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

This site is believed to be connected to the oldest house in Arlington County.

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

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