The roundhouse you mention south of Wheeling, W.Va. was the B&O's Benwood roundhouse. My early memories tell me that one was gone by the mid-1990s, though the coaling tower stood for a little longer. I can remember travelling up to Wheeling with my grandfather and, as a five- or six-year old boy being fascinated by seeing it, and then disappointed when one day both buildings were gone.
Just northwest of where I am (Elkhart, Ind.) stands a Michigan Central roundhouse in Niles, Mich. I think it is used by a some kind of local business. It appears to be in good condition, and the turntable remains intact as well.