Today Architectural Digest takes you to Charleston, South Carolina to tour a grand double mansion that predates the United States itself. Built roughly 275 years ago, 69 Church Street is a landmark of surviving precolonial architecture with exquisite woodwork details and outdoor reception spaces perfect for hosting guests. For those in the know, a secret garden lies hidden behind a wall of hedges, ready to add another tale to the three-century history of this architectural gem.