The front of the door changed, and after going there, I found a small sign at the entrance of the building half a day later. With Swiss pass, the grandmother at the front desk gave us a free visit and a small toy for the children. The toys in it have a long history and are very valuable for reference. The children are also very happy. Grandma was very enthusiastic to help us explain in English. She bought a small music box as a souvenir when she left.