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

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.

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

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

In the basement of the U.S. Capitol Building is a hidden storage room full of ornate floor tiles leftover from the 1850s.

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

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

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

A computer bug so primitive it was an actual insect.

A haunting tribute to pioneering photographer Clover Adams.

The hidden offices underneath Memorial Bridge have been locked up since 1976.

There's a crumbling old mansion inside the Smithsonian National Zoo.

A Spiritualist house of worship where believers communicate with the dead in the spirit world.

An Industrial Revolution-era public work that purified water using nothing but sand.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

A painfully obvious spy house sits right across the street from the Russian Embassy.

A historic neighborhood church is reborn as a psychedelic arts collective.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

Home to items never before seen by the public.

A college in rural Kansas founded to prepare the country for an impending World War III.

The oldest purpose-built cinema still in operation also houses a museum of movie memorabilia.

Stories of sightless fish and ghostly cowboys are only a fraction of the legends surrounding this Kansas sinkhole.