Say a prayer, bow your head and maybe even light a candle in Cathedral - St. Mary. This important religious building may not always be accessible, so check ahead for times if you'd like to see inside.
You'll have sightseeing choices galore when staying in Novi Sad. Cathedral - St. Mary is a good place to kick off here, but there are lots of other worthwhile attractions to visit. Petrovaradin Fortress, Freedom Square, and Church of the Virgin Mary are close to the principal church and will fill in your day nicely.