I visited this WHS in May 2014. It’s the only Croatian WHS in the Istrian peninsula and it’s worth a visit. It’s very reminiscent of Ravenna and there are outdoor mosaics in the courtyard and facade as well as indoor mosaics too. It’s nothing extraordinary in my opinion when compared to the size, quantity and quality of the mosaics in similar WHS in Italy such as those in Aquileia or Ravenna. The entrance ticket costs 40 kunas now instead of 30 kunas and it gives you access to the basilica, the courtyard with the outdoor mosaics, the belfry and the museum. The view from the belfry is worth the few stairs especially on a sunny day. All in all, it is a worthwhile stop if you’re in Istria but to me it isn’t one of Croatia’s best WHS.