The climb to the top of the tower is available only as part of the Jhieronymus Bosch 500th anniversary celebration. At the end of October 2016, the tower tour will again close to the public. If you want to go, here's the information: When you want to buy tickets for the Wondrous Climb, you can visit the website below (unfortunately this website is only in Dutch) : eenwonderlijkeklim dot nl The Climb is organized by the KringVrienden, their phone number is: 073-613 50 98 If there is a group of 8 people or more who want to visit ‘s Hertogenbosch, the local VVV (tourist) office staff is able to make the reservation for them, perhaps in combination of other activities. For example city walks with a tour guide, lunches, boat tours and diners also. It’s possible to organize a personal program to make your visit to ‘s Hertogenbosch unforgettable.