Tholos of Athena Pronaia, Delphi, Greece, 2017.10.18
The Tholos of Athena Pronaia, Delphi, Greece, 2017.10.18.
Nikon D7200, 12-24mm f/4G lens @12mm f/8, aperture priority.

"The Tholos of the sanctuary of Athena Pronaia, clearly visible from above, is perhaps the most characteristic monument at Delphi and the most important building of this small sanctuary. Located between the later temple of Athena and the Treasury of Massalia, this circular building of unknown purpose is a masterpiece of Classical architecture. It is thought to have been connected with chthonic cults, although Pausanians, who saw its ruins in the second century AD, does not refer to it as a temple."

— Dr E. Partida, "The Tholos of Athena Pronaia"