The Haarlem Organ Museum is managed by the Kunckels Organ Foundation, and features nine unique mechanical organs, including the Kunkels Organ, which is the largest concert organ in Europe. The museum also features the Compton theatre organ, known as the ’Lady Comptopn. There are regular concerts by well known organists. The museum is open every Sunday, but if you wish to visit on other days it is possible to do so with an appointment.