Haapaniemi castle was one of the oldest manor houses in Finland, first record of Haapaniemi dates back to year 1469. The castle manor was built probably between 1450-1525 by the powerful nobleman Henrik Klaunpoika Horn, who owned it until 1540s. After Horns Haapaniemi was owned by another famous noble family Fleming.
The castle manor was ruined in the Great Wrath (1713-1721). Fiskars Ironworks bought manor properties in 1737. Today only an arched stone basement remains the manor house. Haapaniemi is nominated as National Built Herigate by National Board of Antiques.
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.