This huge church is located in the old town of Zurich. It's more impressive from the outside but as entry is free, just go in and have a look. For a small fee, you can climb up the tower, which I highly recommend, the view is worth every single step.
Walk around the entire area whit its cosy cafes, bars, shops and restaurants. The ones on the main alley are aimed at tourists (still not "tourist traps) but if you leave the main street and walk through the narrow alleys, you'll find real gems.
Grossmünsterplatz, 8001 Zürich, Switzerland