Ship skeletons haunt Baltimore's waterways.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

There's an exclusive Beefeaters pub hidden in the Tower of London.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

This plaza at the end of the world teems with monumental tributes to a problematic history, and laser discs.

The most southern point you can drive to in the Western Hemisphere.

Before Nixon, "watergate" meant canals.

The U.S. Navy’s preposterously detailed mini battleship took 77,000 hours to complete.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

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

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

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

An overlooked memorial honoring the local Washington residents who died in World War I.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

A historic arena where the Beatles played their first concert in the U.S.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

Washington's iconic carousel has a nice piece of Civil Rights history.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The hidden offices underneath Memorial Bridge have been locked up since 1976.