Karuna Church served as the chapel church of the parish of Sauvo in Southwest Finland and was built between 1685 and 1686.

There were strict rules of conduct when visiting the church. Men and women sat on different sides of the central aisle, men on the right and women on the left, facing the altar. The seating order also followed a hierarchy: the higher the rank, the closer to the altar one's seat was located.

The bell house, a separate bell tower in the church, built in 1767, displays a statue, called a "vaivaisukko", used to collect alms for the poor. It was originally from the Hapavesi area. These "vaivaisukkot" were typical of churches as money-collecting statues, into which the people of the church could slip money intended for charity.

The churchyard contains the tomb of Axel Olai Heikel, the founder of the outdoor museum, and his wife Maria. Karuna Church is rented out for marriage ceremonies and hosts concerts and services in the summer.