Temple of Apollo - Didyma, Turkey

The Temple of Apollo at Didyma or Didymaion was the fourth largest temple in the ancient Greek world But it was home to both of the temples dedicated to the twins Apollo and Artemis.
https://www.worldhistory.org/article/640/the-temple-of-apollo-at-didyma/

Didyma was an ancient Greek sanctuary:
https://en.wikipedia.org/wiki/Didyma