The hidden church. Built in the early 1600's, when citizens were not allowed to practice Catholism. Jan Hartman lived on the lower lower floors and built the church in the attic after purchasing the 2 small homes behind his house to build the church. The 4th and 5 floor - seating which you can see in the picture, were later added based on the number of attendees. Services were held here for more than 200 years.