The largest part of this amazing river’s course is the national park, which in addition to its natural phenomena abounds with cultural and historical monuments. The most outstanding of these is the Franciscan monastery on the tiny island of Visovac, set in the middle of the lake widening in the river like a precious stone. Within the monastery there is a picture gallery and a church, origins of which are traced back to the 14th century. In the middle of the canyon, upstream of the river, is an interesting Krka Orthodox monastery; while on the high ground above the river several old ruins sit. The old mills, which have been transformed into small ethnographic museums where one can see how wheat was ground in the olden days, are a popular attraction for visitors. Heritage interpreters are dressed in traditional folk costumes, which is particularly interesting and entertaining for children, who are frequent visitors of the park. However, the main attraction of Krka National Park lies in its seven waterfalls. The widest of these is Roški slap, although Skradinski buk is the biggest and most well known.