The Martinitoren (or Martini Tower) is the highest church tower in the city of Groningen. The tower can be found at the north west corner of the Grote Markt, and is a part of the Martinikerk. The tower is nown to locals as ’d’Olle Grieze’ (the old grey one). It offers a wonderful view of the city and the surrounding area. There are some paintings of local historical figures, including Saint Martinus, above the entrance to the tower.