Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

One of the largest collections of Catalan literature and cultural materials outside of Spain, created by a community of 1960s expats.

Recorded as the first person buried in Arlington Cemetery.

There’s a hidden military meme engraved on the World War II Memorial.

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

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

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

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

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

This site is believed to be connected to the oldest house in Arlington County.

‘Bush the old fire dog died of poison July 5th, 1869. RIP.’

This apartment building designed by a notable Washington D.C. architect housed the Qing Dynasty's Legation.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

A memorial to a shareholder activist feared by CEOs around the United States.

A benevolent, 16-foot-tall river dragon lives on a suburban lawn.

These five Art Deco homes were meant to solve the "small house problem."

The headquarters of the Audubon Naturalist Society is a small slice of heaven for nature lovers.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

Literal "money laundering."

There's an old indoor swimming pool hidden directly underneath the White House Press Briefing Room.

This historic building is now home to the Public Access Corporation for the District of Columbia.

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