The Guardian reports that a section of wall stretching for nearly one-half mile was found in the Bay of Mecklenburg, off the coast of Germany, during a survey conducted with a multibeam sonar system. Inspection of the wall revealed that it was made up of about 300 boulders connected with some 1,400 smaller stones. The structure is thought to have been constructed more than 10,000 years ago, near a lake or marsh. Jacob Geersen of the Leibniz Institute for Baltic Sea Research Warnemünde suggests that the wall may have been part of a driving lane used by hunters in pursuit...