The Protestant Church Sst. Simon und Judas Thaddäus Bad Sassendorf is a three-nave, two-bay hall church with a straight closed choir made of local green sandstone. It is the successor to a baptistery built in 1313 and was probably built in the Gothic style from 1420 to about 1500. It completes the series of medieval church buildings in the Soest Börde.
The interior of the church appears lighter and more open than St. Pantaleon in Lohne due to round pillars, tracery windows and cross vaults, which were not inserted until 1905. The pews with closed rows of benches as well as the pulpit and the altar (original form) date from the Baroque period. The apostle figures in the choir room can be attributed to the origin of the church, the stone baptismal font (excavated in 1937) probably belonged to the predecessor chapel.
Church services: every Sunday at 10:30 am.