Sesklo and Dimini fortifications

Sesklo and Dimini are two of the main sites of the Greek Neolithic Period, ca. 6000-3000 BCE. They are located only a few miles apart in the Thessaly region of Greece and were excavated between 1899 and 1906 by Christos Tsountas.

Source: Wikipedia — Sesklo and Dimini fortifications (CC BY-SA 4.0)