Foto de stock - Archaeologists have unearthed a prehistoric cult complex in Durankulak Lake, some 450 km (280 miles) from the capital Sofia in the North East of Bulgaria. The settlement, which dates back some 7,500 years, is known among specialists as 'the Dobrudzha Troy'. It is located on the Big Island on the lake. So far this is the only fully researched archaeological site from the time of Trojan War on the Balkan Peninsula. Researchers have described the Palaeolithic settlement as ""possibly prehistoric Europe's largest stone building"". Archaeologists working on the site, which once covered an area of over 200 square metres, have found traces of about 1400 graves. The site could be even larger if archaeologists can prove that it had two floors. Researchers say that the structure collapsed because of an earthquake but they were able to identify a kiln which was in use for 80 years. Excavations of the peninsula began in the 1970s when researchers found what they believed was Europe's first stone city, originating from around 5500-5400BC when the Neolithic Hamangia-Durankulak Culture was in full effect. Petar Zidarov, an archaeologist from New Bulgarian University in Sofia, told Archaeology in Bulgaria, ""The challenge we are now facing is to reveal the sequence of the layers, or the stages of life, in one of the most monumental buildings ever in prehistoric Europe. The people who lived in this place were not just excellent builders but they were also among the first people in the world who started to smelt metals such as native copper and native gold, to forge jewels out of them, and to trade with them as far as the Mediterranean coast. Where: Durankulak, Bulgaria When: 21 Sep 2015 Credit: Impact Press Group/WENN.com