The so-called Powder Tower (Kruttornet) is the oldest monument in Visby. It was built in the 12th century to protect the harbour. There was initially no door in the tower, but only a small entrance in 10 meters high. Defenders used ladders to climb up to the entrance. Today 25 meter high tower is open to the public in summer season.
References: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.