Accessible only by boat, this centuries-old island fort never saw troops or combat.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

Marvel at this turn-of-the-century masterpiece that has been turned into a rather stately supermarket.

Over thousands of years, this slot canyon was carved out of the bed of an ancient lake.

Where a brain, a beauty, a jock, a rebel, and a recluse met one Saturday and changed their lives forever.

Scenic mount trashmore, Virginia Beach's most curious waterfront still has a couple of secrets.

Affectionately known as "Lord Bot," this historic statue has a cult social media following and rightly claims to be “the most metal inhabitant of the Wren Yard.”

A bronze plaque at an intersection in Hoboken marks the place where the game of baseball first took shape.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

Built by the patriotic residents of Boonsboro in a single day.

This four-story steel sphere in Maryland was used to test biological weapons.

During World War II, blimps were a key part of the United States' defense against German U-boats—this building could house a dozen of the armed airships.

100 years later, they're still down there.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

A whopping 14,000 copper coins cover this miniature fighter jet.

Ship skeletons haunt Baltimore's waterways.

Step inside Lucy, the world's largest "elephant."

This extraordinary Depression-era expenditure was modeled after a postcard of a Mediterranean hotel.

The boulder on which Alexander Hamilton laid his head as he died can still be visited on the New Jersey coast.

A tribute to the hard-working men and women of Grumman, who crafted F-14 fighter jets.