The low country of  South Carolina is one of those places where you walk through time. Different periods of American history are stacked one on another everywhere you turn. Paranormal activity is reported throughout this beautiful state, including hauntings at a fort and two sets of church ruins we visited.    OLD SHELDON CHURCH in YEMASSEE, South Carolina   The Old Sheldon Church Ruins is an historic site 17 miles north of Beaufort, South Carolina in Yemassee, SC.   The church was originally known was Prince William’s Parish Church and was built between 1745 and 1753.  The church was burned by the British in 1779 during the Revolutionary War. The church was rebuilt…