An abandoned sawmill from more than 134 years ago stands testament to the ambition of one man.

The largest self-built castle in the U.S., six decades in the making.

This historic stone barn is the former home of legendary cattleman Charles “Lonesome Dove” Goodnight.

This memorial pays homage to Pueblo's four Medal of Honor recipients.

Check out a hidden collection of vintage neon signs.

A futuristic hovertrain is parked unceremoniously alongside a nondescript road.

A mental health hospital dating back more than 139 years, now features a museum.

The very first subway station in New York City is beautiful, decked out in chandeliers, and ... abandoned?