Kilmartin Castle, a small tower house, dating from about 1580, stands above the village. Kilmartin was a property of the Campbells, many of whom are buried in the churchyard. John Carswell, Rector of Kilmartin and later titular Bishop of the Isles, lived here before moving to his new residence at Carnasserie Castle. The castle comprises an oblong, three-storey main block, with round towers to the north-east and south-west corners, as well as a small stair tower in the west front. Formerly ruined, it has been restored as a private house in recent years. Shot holes and iron yetts over the windows have been retained.
Carswell moved into Carnasserie Castle in 1565 and died in 1572, so kilmartin castle must have been built before either date.
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.