An old dry stone wall on Guelph Line just south of the 25th Side Road. This wall is in poor condition except for a few segments where the brush has grown over, concealing it from view of passing traffic. The Guelph Correctional Centre (formerly Ontario Reformatory, Guelph) was designed by architect John McIntosh Lyle, and has some significant dry stone walls that were built by the inmates (on York Road as you leave Guelph eastbound on Highway 7).