Please don’t anchor your boat onto the Department of Defense’s underwater data cables.

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

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

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

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

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.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

100 years later, they're still down there.

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

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

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

Look closely and you’ll notice that the color changes a third of the way up the tower.

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

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

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

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

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

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

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

A brass plaque dedicated to a convicted cannibal hangs in the National Press Club, and that's not even the craziest part of the story.

This nine-story building is the oldest standing skyscraper in D.C.

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

The oldest Italian café in Boston, this spot also serves as a veritable museum of vintage coffee ephemera.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."