A special touristic attraction are the castles - the so-called "Eagle Nests" strongholds, built of limestone on top of hills.
There are dozens of them. They form the structure of the medieval earthwork defenses of rank unprecedented anywhere in Europe. Most of the castles can be reached from the famous Eagle Nests trail. It is a walking trail (about 163 km) marked in red, while its essence is the fact that in the national register of hiking trails is listed under number 1.