Listen 4 min Comment on this story Comment Gift Article Share Can you tell me anything about the estate known as Walnut Hill, which was in Annandale, Va., on Annandale Road between Graham Road and Gallows Road?... I believe it was once owned by O. Roy Chalk, a businessman who owned the old bus line that was a precursor to Metro.... Get The 7 DMV newsletter in your inbox every weekday morning....