Temple of Hephaestus built
500 BCE.
Shown on the map at 37.976°, 23.721°.
The Temple of Hephaestus or Hephaisteion (also "Hephesteum" or "Hephaesteum"; Ancient Greek: Ἡφαιστεῖον, Greek: Ναός Ηφαίστου, and formerly called in error the Theseion or "Theseum"; Ancient Greek: Θησεῖον, Greek: Θησείο), is a well-preserved Greek temple dedicated to Hephaestus; it remains standing largely intact today. It is a Doric peripteral temple, and is located at the north-west side of the Agora of Athens, on top of the Agoraios Kolonos hill. From the 7th century until 1834, it served as the Greek Orthodox church of Saint George Akamates. The building's condition has been maintained due to its history of varied use.
Text from the Wikipedia article Temple of Hephaestus, licensed CC BY-SA 4.0.