The AAF Tank Museum is Danville's oddball specialist sight, a large private collection of tanks, artillery, cavalry material, uniforms, and military vehicles. It sits north of the centre, so it is not something you stumble into on a downtown walk.
For military-history travelers, though, it is a serious stop and one of the more memorable reasons to detour into Danville. Check opening details before going, since specialized museums like this can have schedules that change more easily than city-run attractions.