When it comes to handsignals (and colonialism) rock always beats scissors.

The fountains of the U.S. Navy Memorial are annually salted with water from the Seven Seas as part of a nautical ritual.

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

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

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

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

A fantastic array of trays and cables once whisked books over to the Capitol at 600 feet per minute.

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

The span is crooked and made from two older recycled bridges.

A clone of a cloned tree that was so important it allegedly had its own guards.

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

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

This lovely pocket park is one of the most under appreciated in D.C.

Home to a vast and influential collection of Shakespeareana.

A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

The oldest continuously operating fish market in the United States.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

When it opened during the final years of the embargo, all the drinks and cigars were free.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

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

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

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

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

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.