Serapeum of Alexandria (temple) built
286 BCE.
Shown on the map at 31.182°, 29.897°.
The Serapeum of Alexandria was an ancient Greek temple built by Ptolemy III Euergetes (reigned 246–222 BC) and dedicated to the Greco-Egyptian syncretic god Serapis, made the protector of Alexandria, Egypt. The site was heavily plundered by Christians in the late 4th century. It housed the daughter library of Alexandria.
Text from the Wikipedia article Serapeum of Alexandria, licensed CC BY-SA 4.0.