History of the world
Whether in prehistoric or historic times, people always needed to be near reliable sources of potable water. Settlements developed on river banks as early as 3000 BCE in Mesopotamia, on the banks of Egypt's Nile River, in the Indus River valley, and along China's rivers. As farming developed, grain agriculture became more sophisticated and prompted a division of labour to store food between growing seasons. Labour divisions led to the rise of a leisured upper class and the development of cities, which provided the foundation for civilization. The growing complexity of human societies necessitated systems of accounting and writing.
Borino
The Rhodopes are considered one of the cradles of European civilization. It is estimated that primitive people settled the region around 65,000 to 60,000 BC. The oldest evidence of human presence in the Rhodopes, flint instruments, was discovered in Borino by an archeological excavation near the current Orpheus Chalet. During fall and winter, eneolithic people lived in the caves of the region. Experts have discovered hearths from this time period dating from 4000 to 3000 BC in Yagodina Cave and idyllic figures connected with the cult to the Woman-Mother and the Sun Cult in Haramiska Cave near the Devil's Throat Cave.