Alejandro Nuñez-Jimenez
Google
Beautiful museum for temporary, modern art exhibitions in a the heart of Zürich. It's worth a visit both because of the collection, which regularly changes, displaying (mostly) local and Swiss creators, and because of the symbolic building that hosts them - and the views of the riverside of town from it.
Access is (as far as I know) always free, and the visit won't take too long (10-30 min, depending on your own pace). I would recommend it if you live there or stay for long. I would not argue it is a must-visit part of the town, though.