The Evangelical-Lutheran St. Martins Church in Morsum was first mentioned in a decree of 1240, however, more recent findings suggest that it was founded earlier than that, which means that St. Martins can be considered the oldest church in Sylt. It was named after St. Martin of Tours, one of the most well-known saints of the Catholic Church, also recognised by the Evangelical Church. Its appearance resembles the island’s most famous landmark, St. Severins Church in Keitum, although St. Martins is missing a church tower. The reason for this was wide spread poverty at the time of construction, which is why not only the church tower is missing but also a bit of the church’s stature. For the church bells, wooden scaffolding called a “Glockenstapel” (bell stack) was built beside the actual structure.
The building is made up of granite ashlars in the lower part of the building, but the upper part is made of brick, which was typical for the architecture of North Frisian island churches before brick became commonplace. At the end of the 18th Century, a front building was added and served as a sacristy.

Over the course of time, numerable parts of the church have had to be replaced or restored, including the Glockenstapel, the altar and the organ. Some of the oldest parts of the church are the baptismal font, the figures on the winged alter and the stoup.