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

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

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

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

The National Park Service’s best-kept secret with views that rival any in D.C.

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

This sculpture presents commentary on a life in pursuit of profits.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

Home to items never before seen by the public.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

A superbly preserved example of Georgian residential architecture that was once home to one of the founders of Alexandria, Virginia.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

The oldest continuously operating fish market in the United States.

The final resting place of an unidentified revolutionary soldier sits behind a Virginia church.

Long buried under the 20th-century landscape, this lift lock of the Alexandria Canal is the lone remnant of an ambitious early American transportation project.

The narrowest house in America is seven feet of pure spite.

The World's Largest Bull.

One of Mexico's youngest major cities still holds on to this structure representing its short modern history.

In 2010, Nicolas Cage purchased two plots in this cemetery using one to construct this strange pyramid mausoleum.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

The island home of an unlucky whaling captain whose story inspired a great American novel.

A colossal statue with a controversial past, forgotten for more than 30 years.