Within the grounds of Castle Semple Regional Park, there are the ruins of the former Collegiate church. The church was built as a place of worship serving the former Castle Semple. The castle is long gone and there is no trace of the building today with only the church remaining.
The church building is solid and the grounds are maintained. The building has no roof, but it does appear the building has been preserved to prevent further deterioration.
The church is Gothic in style and is believed to date back to 1504. The church was founded by Lord Sempill Who lost his life at the battle of Flodden in 1513. When he was killed his son has the church building altered and extended to accommodate his late father's tomb.