St. Nicholas' Fortress (Croatian: Tvrđava Sv. Nikole) is a fortress located in the town of Šibenik, one of the oldest native Croatian towns on the eastern shores of the Adriatic, in central Dalmatia, Croatia. It was included in UNESCO's World Heritage Site list as part of "Venetian Works of Defence between 15th and 17th centuries: Stato da Terra – western Stato da mar" in 2017.Tourists are currently not allowed to enter the fortress, but only explore it from outside. The reason is that the fortress is currently being reconstructed. The reconstruction should be finished till the end of 2018.