D.C. once had its own tiny rival to the New York Stock Exchange.

The only public swimming pool in Baltimore open to Black Americans during segregation is now a permanent memorial art exhibit.

This free, take-a-book shop seems like a trick but isn't.

Public opinion is still divided on this enormous sculpture in front of Baltimore's Penn Station.

At this former Prohibition speakeasy, electric birds signaled the arrival of hooch.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

Once America's tallest structure, now a Baltimore landmark.

One artist’s scheme to expand museum viewing hours into the evening led to the illumination of an entire city.

Baltimore's first skyscraper may be home to the inspiration behind pulp fiction's most celebrated bird.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

The first marker along the famous boundary.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Go inside to really appreciate this 500-year-old technological masterpiece.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

This candy-colored storybook village originated as a 19th-century Methodist campground.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Historical figures from New York City's Catholic community reside in Midtown.

A bit of retro transportation flair preserved in the world's largest department store.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

The "Seinfeld" diner.

A spiritual vortex among the red rocks in Sedona.