Situated less than 6 km south of the Bulgarian-Romanian border, the Durankulak Lake is famous for hosting more than 250 rare species – fish, reptiles, amphibians, marsh birds and plants, many of them included in the Red Book of Bulgaria. The lake is declared protected area. But it is not only nature that attracts experts and tourists to this place. On the Big island, in the lake, is located an archaeological park called by the scientists “Bulgarian Troy”. The stone architectural complex (the oldest monumental structure in Europe) and the temple of Kibela – The great goddess-mother, date some 7000 years back to the prehistoric times. Here is the largest, found in the world, Eneolithic settlement, which existed permanently more than 1500 years (5300-3800 BC) and was inhabited, with some interruptions, more than 6000 years. The excavations revealed over 1200 funerals. The numerous gold and copper objects in the necropolis and the decorations from Spondylus and Dentatum are witness for active commercial relations with distant regions. The remains found there prove that the ancient inhabitants of this settlement possessed high level of economical, technological and cultural development.