I think it is the Neolithic settlement Smilčić, near Zadar. <-- Croatia really does look interesting. I haven't been there.
From Wikipedia:
The Neolithic period (c. 6000 BC – c. 3000 BC) was characterised by the emergence of permanent, organised settlements, and by the production of earthenware and other items. In the Adriatic area, the most significant Neolithic cultures are the Impresso, Danilo and Hvar cultures, and, in the interior, the Sopot and Korenovo cultures, while the major sites where finds have been recovered are Smilčić near Zadar, Danilo near Šibenik, Markova and Grapčeva Caves on Hvar, and others. In the early Neolithic period, the Starčevo, Vinča and Sopot cultures were scattered between and around the Sava, the Drava and the Danube. Notable are the excavation sites of Ščitarjevo near Zagreb, Sopot near Vinkovci, Vučedol near Vukovar, Nakovanj on Pelješac.
Smilčić, near Zadar, one of the richest Neolithic sites on open ground. The settlement was surrounded by a defence moat and the dwellings were huts built above ground from interwoven branches. It has been established that the settlement developed in two stages: the earlier stage, with finds from the Impresso culture, and the later stage, characterised by the Danilo culture. Among the finds, some ceramic, richly decorated cultic vessels with four feet (rhytons) stand out, as well as various vessels decorated with paintings and engravings.