A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

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

Also known as the Founding Church of Scientology.

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

Behind an abandoned storefront is an example of pioneering 1930s gas station architecture.

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

They sort through millions of dollars worth of diplomatic gifts on behalf of the government.

The first memorial dedicated solely to the Black troops who fought for the Union.

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

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

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

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

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

A much-maligned monument to teetotalism.

A historic arena where the Beatles played their first concert in the U.S.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

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

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

The privately owned cemetery that holds room for Washington's finest when they step down from life.

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