This stone tower marks a lookout point over the historic Washington Crossing, and maybe some buried treasure.

Mysterious rocks that ring musically when struck.

A tribute to those that perished during the American Revolution.

A former plant in one of the hubs of U.S. steelmaking has been turned into this museum celebrating the history of American industry.

The famous bell was secreted away and hidden in a church in Allentown during the British occupation of Philadelphia.

This historic old movie house was the scene of one of the Blob's most iconic attacks.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

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

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.

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

The "lovely red Vega" of the legendary record-settling pilot.

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

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

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

Largest Roman Catholic church in North America.

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

The most decorated dog of World War I is preserved in the Smithsonian.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.