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http://archaeologyinbulgaria.com/2015/09/13/archaeologists-find-7500-year-old-cult-complex-europes-largest-stone-building-in-island-prehistoric-settlement-in-bulgarias-durankulak-lake/
Archaeologists Find 7,500-Year-Old Cult Complex, ‘Europe’s Largest Stone Building’ in Island Prehistoric Settlement in Bulgaria’s Durankulak Lake