The office can be visited only with a guided tour, a valid ID is required.
September - March: Mon - Fri: 10:30 a.m., noon, 2:30 p.m., 4 p.m.
April - June: Mon - Sat: 10:30 a.m., noon, 2:30 p.m., 4 p.m.
July - August: Mon - Sat: open nonstop from 10 a.m. to 4 p.m., tours start at 10:30 a.m. and the last one is at 4 p.m.
Adults: CHF 12
University students, Seniors, Disabled: CHF 10
Youths (6-18): CHF 7
Tours need to be booked ahead only for groups of more than 15 people.