Saint Peter's Seminary, located in Cardross near Helensburgh, is a modernist masterpiece designed by architects Andy MacMillan and Isi Metzstein. Built in 1966 as a training college for Roman Catholic priests, the seminary features a distinctive zig-zag design and concrete appearance. Despite being abandoned in the 1970s and facing years of decay, it remains a popular spot for architecture enthusiasts. The Catholic Church recently transferred ownership to the Kilmahew Education Trust, marking a new chapter for this iconic but long-neglected building.