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

Every drop of D.C. tap water flows through this old waterworks.

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

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

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

Also known as the Founding Church of Scientology.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

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

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

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

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

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

Art deco landmark on the outskirts of Washington, D.C.

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

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

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

Berkeley Hot Springs presents to you "the only outdoor monument to presidential bathing."

A stone marker memorializes the spot where the King broke up a street fight with a classic karate stance.

Charleston's historic city jail once held everyone from pirates to Civil War POWs.

One of the only memorials dedicated to journalists who died in combat.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

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

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones' Locker.