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

This general store is more than a century old and home to various oddities and antiques.

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

A walk through the historic city center, under the streets of Seattle.

A town trapped in time - 1958 to be exact.

One-time largest man-made structure in the world will be a park in 30 years.

Once America's longest-manned military fort, now an abandoned hulk.

Failed state-supported institution meant to rehabilitate students with intellectual disabilities.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

Cryptic messages embedded in the New York City sidewalk.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

A museum dedicated to the history & joys of the trail & your best chance to see hikers throwing up ice cream.

A diorama of the Civil War, fought by cats.

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

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.

The site of the climactic scene from the classic horror film is now a historic landmark.

A former major munitions plant that has been converted into a sprawling art space.

At 207 feet, one of the world's longest continuous escalators.

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

This pun was simply waiting to come to life, and one defense contractor made it so.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

This pre-Revolutionary War grist mill ground corn and flour for soldiers in seven American wars.

The Grand Ole Opry's big voice came from a small home in rural Virginia where she was eventually buried.

Outsider art meets paleontology at this roadside reptile repository.