Temple of Hephaestus/Theseion Ναός Ηφαίστου/Θησείο Temple of Hephaestus, Athens Location within Athens General information Town or city Athens Country Greece Coordinates 37°58′32.22″N 23°43′17.01″E﻿ / ﻿37.9756167°N 23.7213917°E﻿ / 37.9756167; 23.7213917 Construction started 449 BCE Completed 415 BCE