The church was designed by Alvar Aalto and completed in 1957. It is said to be Aalto’s most original church design. The church gets its name from the three crosses at the altar. It consists of three consecutive halls which can be separated by sliding walls; this enables parts of the church to be used for parish activities during the week. The exterior of the church is white with a copper roofing. DOCOMOMO has listed the church as a significant example of modern architecture in Finland.