One of Šibenik’s unique attractions are its four fortresses which for centuries served as a defence against incoming enemies. Three of the fortresses have been renovated, St. Michael’s, St.John's and Barone, whilst the fortress of St. Nicholas, which is built and encompasses the surface area of an entire island, in 2017 has been inscribed on UNESCO's Protected World Heritage List. St Nicholas' Fortress can be reached by sea or by road in the hinterland of Zablaće.