Most of Croatia proper is distinguished in Croatia by its relatively high population density – a consequence of the fact that the region was spared from large-scale war damage. This also allowed preservation of numerous cultural heritage sites, including medieval city cores, hill forts, manor houses, castles, palaces, and churches. Because the medieval Kingdom of Croatia was governed by rulers based further south, in areas closer to the Adriatic Sea coast, there are few Early and High Middle Ages monuments preserved in the region—most of them date back to the Late Middle Ages and later periods. There are, however, archaeological sites with features from prehistory and classical antiquity. The most significant prehistoric site in the region is a "Homo neanderthalensis" site discovered in Krapina.