I Have a Thing For Caves.
Indian Rockhouse Shelter, Buffalo National Park, Arkansas
246 ft wide, 196 ft deep
"The shelter, excavated several times in the 1930's and 1970's, produced findings consistent with usage over many thousands of years. Some of the materials recovered include: human remains, corncobs, acorns and hickory nuts, limestone slab milling stones, a variety of points, chipped stone and bone tools, mussel shells, cordage and basketry, and shell-tempered potsherds." -Buffalo National River Guide
Remind me to show you my rock collection someday.