This early Gothic Revival brick church has rectangular massing, elongated pointed-arched windows, and a square tower rebuilt in 1927. It is probable that the designer was the talented clergyman John Henry Hopkins, who had recently designed Trinity Episcopal Church in Pittsburgh and Christ Episcopal Church in Meadville. Hopkins left the area in 1831 for Boston and was elected the bishop of Vermont in 1832; he wrote the first book in the United States to deal specifically with the Gothic style, Essay on Gothic Architecture, in 1836. His two earlier churches mentioned above were replaced in the 1870s, but St. Peter's remains, a valuable artifact of early Gothic Revival in the United States. The interior has enclosed pews whose doors were removed in the 1870s and reused as wainscoting along the walls. St. Peter's Episcopal Church coincidentally shares the name of the first chapel built in Fort Le Boeuf in the 1750s.