Three churches can be seen to the south of the abbey. Koorkerk, known as the choral church, boasts a 14C nave and 15C organ chest whose case was restored in the 16C; the 16C Nieuwe Kerk hosts organ recitals in summer; and between the two stands Wandelkerk, flanked by the 85m/278ft-high Lange Jan tower. This octagonal stone construction dates from the 14C and is crowned by a small 18C onion dome.