A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

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

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

This statue of the "father of television" stands prominently in the United States Capitol.

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

The sculptor was instructed to add “stallion attributes” to the general's bronze mare.

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

Corn-inthian columns with a uniquely American take on neoclassical architecture.

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

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

The only tennis court that falls under the jurisdiction of the central bank.

A tiny chapel clings to a precipice above Germany’s gemstone capital.

Outside the Department of Transportation, a collection of artifacts honors the history of how we get around.

The tunnel under the Capitol Building where Congress takes out its trash.

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

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

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

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

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

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

This grand gothic brewery has been pumping out suds for over a hundred years.

Before Nixon, "watergate" meant canals.

A portal into the bricked up canal that runs through the heart of Washington D.C.