Please make your advanced booking as early as possible! With your registration, we will assign one or more tour guides to your group. Each tour guide can accompany a maximum of 15 persons. An guided overview tour lasts approximately 2.5 hours. Shortly after completing your registration, you will receive written confirmation and an invoice for your tour. The phone number of the tour guide will be included in the written confirmation, and you can contact this person directly and in advance with any questions or queries.