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

Before Nixon, "watergate" meant canals.

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

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

Decades before the scandal, this staircase on the river was a literal "water gate."

The oldest continuously operating fish market in the United States.

A nostalgic bibliographic gem.

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.

Millions of numbers carved in glass represent the tattoos forced upon victims.

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

The site of Paul Revere's historic two lantern warning.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

The palatial McDonald's that inspired Wesley Willis.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

Rifle through images of skyscrapers, Worlds Fairs, and more in the largest public postcard repository in America.

Illegal drag racing two stories beneath Chicago’s streets.

Not to be confused with the iconic New York City skyscraper, this Chicago building is a vibrant hub for artists.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

Where Cusack's record store from the film "High Fidelity" was located.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

A hot dog stand where the heads are just as hot as the dogs.

A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.