This is a lovely church with stunning interiors, located just next to Charles bridge. While the opening times of the church are not always according to what's published, it's well worth the visit.

We walked in and said “wow”. It’s tucked away at the end of the Charles bridge and thousands of people walk right by without even noticing it. Don’t make that mistake, it’s free to enter. Baroque sty.

17th century church near the Old Town Tower of Charles' Bridge with a Baroque interior and a fresco in the 41m high dome. They hold evening concerts there which I am sure would be worth going to.