Frankopan Castle is a castle located on the southwest coast of the island Krk, in the ancient town of Krk, which is one of the oldest towns in the Adriatic, in Croatia.
Wikipedia https://en.wikipedia.org/wiki/Frankopan_Castle
Address 1 Trg Kamplin, Krk 51500, Croatia
Coordinates 45°1'32.652" N 14°34'34.909" E