Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

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

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

A historic neighborhood church is reborn as a psychedelic arts collective.

A computer bug so primitive it was an actual insect.

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

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

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

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

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

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The whole world in one water tank.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The most accurate timepiece in the world.

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

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

Before Nixon, "watergate" meant canals.

This golfball sized platinum iridium cylinder is the official starting point for all national weight calibrations

A wondrous old library overlooking the nation's capital.

The romance of early commercial flight still fills this Art Deco destination.

The Virginia home of one of the signers of the Declaration of Independence is being preserved with a unique glass facade.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

The inventor of a number of hybrid corn species is immortalized with a field of giant corn.

The pop art icon's gravesite is broadcast 24 hours a day on his museum's website.