This was high on our list of off the beaten track attractions in Amsterdam. As cat lovers we seek out unusual attractions while on vacation, including shelters that are a little different. This is on a boat on the Singel and open for a couple of hours in the afternoons. There is no fee but donations help care for the cats. We bought a great tshirt as a less touristy souvenir. The cats are well loved and cared for and we had a great time sitting with other cat lovers playing and tickling the cats. We visited the katten cabinet the same day which made a great pair of activities if you are looking for something a little different and more "real" in Amsterdam.