Amid the sprawling Defense Intelligence Agency Headquarters is one of Washington's least accessible museums.

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

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

A diminutive plaque recalls the treetop sniper who almost killed Abe Lincoln.

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

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

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

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

The district's only illusionarium supports free writing programs for local students with every purchase.

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

A historic ruin just 20 feet away from a busy highway onramp.

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

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

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

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

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

This poor little statue is the most vandalized memorial in Washington.

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

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

A fantastic array of trays and cables once whisked books over to the Capitol at 600 feet per minute.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

The towering figures were created from the cemetery's fallen old-growth trees.

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

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.