The Mysterious Cincinnati Tablet
It's a 5-by-3-inch piece of fine-grained sandstone carved with curving, swirling lines and dots in the center of its field and a series of diagonal and straight marks along its edg…
It's a 5-by-3-inch piece of fine-grained sandstone carved with curving, swirling lines and dots in the center of its field and a series of diagonal and straight marks along its edg…