Sibenik was the last stop before the eventual end of my balkans coastal route in zadar.
The city IS as most have said, surprisingly charming. It lies at the slope of the coastal mountain range and surveys a spectacular strait. As such, good panoramic photos are a given.
The OU however IS based on only one building, the Cathedral, which is nothing short of fascinating. It was built 100% out of stone in an early renaissance style. Imo this IS enough to Grant the building WHS status. Furthermore It's actually a very pleasnat and harmonious building. The outside IS decorated with dozens of sculpted faces and the interior, though sober, IS very fitting. Overall, among an ocean of cathedrals and churches in the list, sibenik manages to be outstanding, charming and unique. A particular point i've seen no one mention IS that because of how It was constructed, the Cathedral's interior perfectly reflects Its exterior, which in part makes for the very unusual appearance of the church.
Apart from the Cathedral sibenik can offer quite a bit more. The old town is pretty and fortunately not overrun by tourists (a very welcomed change indeed after Split, Trogir and Dubrovnik). The mountainside has a few fortifications, built in order to protect the city from ottoman forces. They make for an interesting added value (when i went they were trying to accomodate the defenses of the city for tourism, which i've no doubly Will make them far more enjoyable). right in the straits St Nicholas fortress IS actually part of venetian works of defence, though i'm not sure you can actually go there (and I've been told It's not worth It). Finally nearby you've got krka National park, quite similar to the more famous plitvice National park. Unfortunately i ran out of time (and money) and couldn't go, so instead i toured the beautifull natural reserve along the straits, which I honestly recommend.