These days they have a museum for everything, and in McLean they have a museum called The Devils Rope Barbed Wire Museum. When you think about the name, it sounds worse than it is, it is actually way more interesting than creepy, as most would think. This museum was opened in 1991, and focuses on the history of barbed wire. You can get a tour March 1- November 1 on any day except Sunday from 9-4pm (http://barbwiremuseum.com/). What seems simple turns into a complex subject as you learn where it came from, what all it has been made of, and the various uses of barbed wire.