The old Jajce city core with the Citadel and other individual sites inside, but also outside the walled city perimeter, such as the King's Grave, or the Jajce Mithraeum, Church of St John in Podmilačje, Vinac Fortress, orthodox Church of the Most Holy Mother of God, Franciscan monastery of Saint Luke, Roman Catholic cemetery Hrast [Wikidata]Roman Catholic cemetery Hrast, including the Pliva waterfall, is declared National Monument of Bosnia and Herzegovina by KONS, as the natural and architectural ensemble of Jajce and proposed as such for inscription into the UNESCO's World Heritage Site list.

[1][2] The fortress was built, on the site of earlier fort, by Hrvoje Vukčić Hrvatinić, the founder of Jajce.

[4]: 36 Skenderbeg Mihajlović besieged Jajce in 1501, but without success because he was defeated by Ivaniš Korvin assisted by Zrinski, Frankopan, Karlović and Cubor.

It is the first to be built, on the top of the hill called Hum at 470 m.a.s.l., at the end of the 13th and beginning of the 14th century as the fortress for Bosnian Grand Duke, Hrvoje Vukčić.

[1] Today, the citadel consists of a main portal, decorated with the coat of arms of the royal Kotromanić dynasty, two large bastions, and inside a gun-powder tower.

The western perimeter rampart starts at the western corner of the citadel, near its main portal, and follows southeastern downward direction to "Medvjed tower", than, the wall goes further south of to the Pliva river, than turns to the east toward the southern main city-gate the "Travnik gatehouse", wher it ends.

It was founded and started developing in the Middle Ages and acquired its final form during the Ottoman period.

There are several churches and mosques built in different times during different rules, making Jajce a rather diverse town in this aspect.