  The megalithic enclosures of Gobekli Tepe (Urfa, Turkey) are the most ancient
sacred structures of stone known so far, dating back to the 10 millennium BC.
The possible presence of astronomical targets for these structures is analysed,
and it turns out that they may have been oriented, or even originally
constructed, to celebrate and successively follow the appearance of a new,
extremely brilliant star in the southern skies: Sirius.
