Scaremare in Lynchburg, VA is by far the most popular standalone haunted attraction in VA. I havent been in about 8 years but I remember the last time I went I waited for over 4 hours. Definitely alot of people go there so I'd get there early. I dont know how good their show is these days but if you live anywhere within decent driving distance its prolly worth checking out!
http://www.scaremare.com/