 Since before the American Civil War, witnesses say that on the anniversary of Braddock's departure they can hear shouted military orders, horses' hooves on cobblestones, the sound of men marching, and the sound of metal clanking against metal.The sounds can be heard near the old Long Bridge or near the Georgetown bluffs overlooking the Potomac River.Halcyon House (3400 Prospect Street NW) is a mansion originally built in 1787 by Benjamin Stoddert, the first Secretary of the Navy.