Jajce's 21-metre Pliva Waterfall is the only urban waterfall in Europe that drops directly into a river junction, where the Pliva meets the Vrbas in a theatre of limestone and foam. The cascade once powered medieval grain mills and supplied Jajce's Ottoman garrison; today it anchors a town layered with fortifications from four empires. Travnik, 45 kilometres northeast, served as the seat of Bosnian viziers from 1699 to 1851, its skyline still marked by the twin towers of the Šarena Džamija and the stone silhouette of a hilltop fortress that commanded the Lašva valley. A Travnik and Jajce tour from Sarajevo threads the high plateaus of central Bosnia, crossing ridges where Partisan monuments rise from forests of beech and black pine. The route climbs through Vlašić mountain passes before descending into Travnik, where the Plava Voda spring emerges from a limestone cave at the base of the old town. Ivo Andrić set his Nobel-laureate novel Travnička hronika in the vizier's court here; the house where he was born in 1892 now holds manuscripts and first editions in Ottoman Turkish and Serbian. The town's clocktower, built in 1726, still chimes on Rumi time, the Ottoman solar calendar that divides daylight into twelve equal hours. Jajce sits at the confluence of the Pliva and Vrbas rivers, its medieval core encircled by walls raised during the reign of Tvrtko II in the fifteenth century. The town served as the last capital of the Bosnian kingdom before Ottoman conquest in 1528; the cathedral catacombs beneath the Church of St. Luke hold the tomb of the kingdom's final monarch. In November 1943, Tito convened the second session of the AVNOJ council in Jajce's schoolhouse, a meeting that laid the constitutional foundation for postwar Yugoslavia. The waterfall conservation fee supports platform maintenance and riverside access; viewing decks extend over the falls' edge, where spray rises in columns during spring melt. Pliva Lakes lie six kilometres west of Jajce, two aquamarine reservoirs separated by a chain of wooden watermills that ground grain until the 1950s. The mills, restored in the 1970s, are among the last operational examples of horizontal-wheel technology in the Balkans. The larger lake, Veliko Pliva, stretches four kilometres along a valley floor where Ottoman caravans once watered horses en route from Banja Luka to Sarajevo. Central Bosnia heritage tours combine Travnik's vizier legacy with Jajce's medieval fortifications and the Pliva watermills in a single mountain crossing, typically departing Sarajevo at dawn and returning after dusk.