The Church of the Most Sacred Heart of Jesus in Koszęcin, built between 1907 and 1908, is a significant example of sacral architecture in the Diocese of Gliwice. Designed by architect Ludwig Schneider, the church was constructed thanks to the financial support of Prince Hohenlohe, who contributed a substantial portion of the funds. The church was consecrated on October 15, 1908, with the first service conducted by its builder, Father Boehm. Notably, in 1916, the church was formally consecrated by the Bishop of Wrocław, and relics of St. Geron and St. Socieron were placed in the main altar.
From the outset, the construction faced significant financial difficulties, resulting in a low rate of debt repayment for several years. The debt was eventually settled in 1923, aided by inflation. Over the years, the church has undergone no major architectural alterations, with only the tower and roof coverings being modified. Contemporary changes include replacing the original gray slate and clay tiles with zinc and later copper sheeting.
The church features valuable elements such as a pulpit, an 18-voice organ built by Karl Spiegel just before World War I, a side altar, and a painting of St. Isidore. In 1998, the church was designated a historical monument. The parish, with approximately 3,100 members, is surrounded by newer parishes established after World War II, reflecting the growth of religious life in the region.
A notable fact is that the church has retained most of its original architectural features, making it a unique testimony to the era in which it was built.