This detail of the Madonna stained glass window from the Potsdam United Methodist Church is part of a four-church tour of downtown Potsdam Friday, July 9 at 10 a.m., sponsored by the Potsdam Public Museum. The tour, beginning at the museum, 2 Park St., will be given by local stained glass window researcher and authority David Martin. The tour includes the First Universalist Church (now the museum), the First Presbyterian Church, corner of Elm and Lawrence Ave., the Potsdam United Methodist Church, Main Street, and the Trinity Episcopal Church, Fall Island. To find out more, visit www.PotsdamPublicMuseum.org or call 265-6910.