Up to 13 people: individual entry

For groups with their own guide of up to 13 people, including the guide. To benefit from the reduced or free rate, visitors must individually prove their condition with valid and current documentation. They can purchase individual tickets in advance online here.

From 14 people onward: group entry

For groups with their own guide of 14 people and above. This type of entry has a fixed rate, which does not allow for individual discounts or free entries. Advance reservation of an access time is necessary through the group booking website here.