The island of Delos (Greek: Δήλος, [ˈðilos]; Attic Δῆλος, Doric Δᾶλος), isolated in the centre of the roughly circular ring of islands called the Cyclades, near Mykonos, is one of the most important mythological, historical and archaeological sites in Greece. The excavations in the island are among the most extensive in the Mediterranean; ongoing work takes place under the direction of the French School at Athens and many of the artifacts found are on display at the Archaeological Museum of Delos and the National Archaeological Museum of Athens.

Delos had a position as a holy sanctuary for a millennium before Olympian Greek mythology made it the birthplace of Apollo and Artemis. From its Sacred Harbour, the horizon shows the two conical mounds (image below) that have identified landscapes sacred to a goddess in other sites: one, retaining its pre-Greek name Mount Kynthos, is crowned with a sanctuary of Dionysus.