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.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

This hollow steel globe is the second-largest in the world.

In a pedestrian tunnel on North Carolina State’s campus resides an expressive and artistic free-for-all.

Bronze frogs link the town’s hidden waterways with the people who shaped it.

A desiccated merman and a walrus penis bone are among the oddities in this eclectic collection of shipwreck treasures.

The final resting place of a prominent Black American farming family sits in the shadows of an IKEA store.

The only place for a truly presidential dram.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

A secret greenspace hides atop a Capitol parking garage.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

The Ayo Rock Formations stand out on the island of Aruba as a unique arrangement of giant boulders with interesting crawl spaces to explore.

This 15-foot red anchor sits on a rise overlooking the sea lanes of eastern Aruba.

See how aloe goes from field to store and discover the history of aloe cultivation in the Caribbean.

The remnants of an abandoned, 19th-century gold mill along Aruba's rugged northeastern coast.

Aruba’s first chapel.

A sprawling beachfront burial ground for Aruba's departed pets.

These trees are living witnesses to events that inspired poet Walt Whitman’s service during the American Civil War.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

Where three rails and three centuries of transportation meet.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.