The Counts of Rapperswil probably built a defense tower in the early 12th century on the site of today's Greifensee Castle. The beginnings of Greifensee Castle, which was partially destroyed in May 1444 (during the so-called Old Zürich War), date back to around 1250. The castle complex consisted of a Palas on a rock , which at the time stood directly on the lake shore and was protected on the other sides by a moat and ring wall. In 1520, the Zürich Council decided to rebuild the ruins to a modest castle.
After thorough renovation, the castle is now available to the public for conferences, seminars, lectures, presentations, receptions, courses, small concerts, exhibitions, cocktails and private events (banquets, weddings). You may also rent single rooms only.
The first written record of church in Danmark locality date back to the year 1291. Close to the church are several stones with a Christian text and cross inscribed. The oldest parts of the present red-brick church are from the 1300s. In the late 1400s the church was enlarged to the appearance it has today. The church has been modified both internally and externally several times, among other things after the fires in 1699 and 1889. There are lot of well-preserved mural paintings in the walls.