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

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

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

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

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

The institution is sitting on a goldmine of 21,000 paints, varnishes, pigments, and primers preserved for posterity.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

Perhaps the most scandalous statue of America's first president.

Four bald cypress trees in Lafayette Square, across from the White House, mark the southern edge of a 100,000 year old cypress swamp.

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

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

A nostalgic bibliographic gem.

People escaping slavery may have hidden inside a corpse vault.

The walls of the iconic dome are hollow and have a secret stairway.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

The U.S. Navy’s preposterously detailed mini battleship took 77,000 hours to complete.

After his presidency, George Washington planned to live only a few blocks from the Capitol building.

A surprising, but overlooked example of geology in the middle of the nation’s capital.

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

The 28,000-year-old specimen is remarkably intact.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

Disks are rolled out onto the south lawn to absorb the impact of Marine One's wheels like giant coffee coasters.

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