It's about thirty minutes walk from the pier, it's worth seeing. It happened to be Sunday, and there were activities inside, so we could not go in, but we stood in the porch area and listened to the beautiful sounds of singing and organs for a few minutes. The church will not reopen until the boat leaves, and we are satisfied just by stopping by the magnificent door-reminiscent of Notre Dame Cathedral. We also strolled around in the bishop's palace garden. There is also a museum and cafe, but we don't have time to visit. But the walk to the cathedral is very worthwhile.
Before we visited the tourist information center, we didn't know about this museum. When I went to visit, the door didn't open until 2:30 in the afternoon. The reception staff were very enthusiastic and liked the exhibits in Rome. They were all excavated in an arched cellar.