Göbekli Tepe

In the center of the circles are two monolithic columns, five meters high, covered with mysterious reliefs depicting animal silhouettes.

An excerpt from the article 18 facts about Göbekli Tepe
It is believed that they had a symbolic role as guardians. The reliefs depict scorpions, charging boars or lions. The reliefs vary in style, some are quite simple, others carefully executed, sophisticated. Six stone troughs with a capacity of up to 160 liters were discovered within the temple walls. Sediment containing oxalates, which precipitates when water combines with cereal grains, was found at their bottom - perhaps prehistoric people brewed beer there. According to the Museum of Archeology and Mosaics director in Sanliurfa, such architecture and symbols cannot be seen in any other place.