The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.

Eighteen miniature death-scene dioramas.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

D.C. once had its own tiny rival to the New York Stock Exchange.

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

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

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

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

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

This nine-story building is the oldest standing skyscraper in D.C.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

A building shaped like the Army Corps of Engineers logo, because why not?

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

When it comes to handsignals (and colonialism) rock always beats scissors.

Before Nixon, "watergate" meant canals.

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

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

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

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

Obscure Freemasons still live in D.C.’s largest private residence.