Groningen's oldest church, built in the 13th century in the centre of the medieval town and rebuilt and enlarged over the next three hundred years. The Romanesque nucleus is still visible in the choir, and the late-Gothic vaults of the main hall display a remarkable cycle of 16th-century frescoes — among the largest medieval wall paintings preserved in northern Europe.
The interior is sparer than the exterior suggests, in keeping with the Reformed tradition that took over the church in 1594. The famous Schnitger organ is the centrepiece; concerts are held throughout the year. Climb the adjoining Martini Tower for the best view in the city.