Brick church with two steeples built in 1901. The organ is from 1972, has 32 pipes and is considered to be the finest concert organ in the district. The former medieval church burned in 1898. Slagen's oldest preserved altar piece, a unique, magnificent, late medieval triptych from about 1480 with twelve carvings depicting St.Ursula's journey to Rome, was saved. It is now in the University Museum of Antiquities in Oslo. The painter, Sven Jørgensen, one of Vestfold's better known artists, is buried here in Slagen Church cemetery. Church Service every Sunday 11 am.