Is this museum open on Monday (20th May) and if so what are the hours of business.
I'm not sure what days tours are run. Your best bet would be to contact them through their website -google this....
Don't forget to let them know if you're after an English speaking tour. We stayed at the Youth Hostel in Interlaken and the lady at the desk phoned ahead and organised it for us.
Erhalten Sie schnelle Antworten von den Mitarbeitern und früheren Besuchern (Artilleriewerk Faulensee).