A team from the University of Haifa in Israel have discovered at least 5 sites that may have been constructed by the invading Hebrew armies in the days of Joshua. The structures are built in the shape of a foot, and may signify ownership of a land. The Bible references stone structures such as these (hebrew gilgal) 39 times.

http://newmedia-eng.haifa.ac.il/?p=218

http://esciencenews.com/articles/200...ped.enclosures