St. Euphemia's Basilica (Rovinj)
It is the epicenter of Old town Rovinj!
The walk up is slightly steep but the awards are a great church and a stunning view over the landscape and sea. The interior is beautifully decorated and the cathedral has some amazing religious artifacts. The tower offers great views all around for a small fee to ascend.
It is really a must for anyone who enjoys visiting old churches, archeological sites, and beautiful places. The atrium and mosaics are really first class. I was surprised to find such a beautiful place in Porec.