CHARLESTON, SOUTH CAROLINA, a city that has had a strong preservation movement since the 1920s, is rich with Georgian, Federal, and Greek Revival houses, with old churches, cemeteries, and gardens. It has been widely documented, but no book about Charleston could be more intimate than this latest. Photographers Steve Gross and Susan Daley return to the place where, on a road trip in 1985, their infatuation with old houses began. They re-introduce us with photo essays on the Old City, Charleston as the holy city, its wrought iron, hidden gardens and piazzas. Then they take us inside 14 houses in town and eight more places in the Lowcountry. Both private and museum houses are featured— some newly restored, some with their original furniture, others preserved as found. Many are well…