The island of Delos lies just a few miles away from cosmopolitan Mykonos and the nearby island of Rineia, in the centre of the Cyclades archipelago, and is one of the most important mythological, historical and archaeological sites in Greece. Since 1990 Delos has been declared a UNESCO World Heritage Site. The excavations on the island are among the most extensive in the Mediterranean; many of the artifacts found are on display at the Archaeological Museum on Delos and the National Archaeological Museum of Athens. Delos was a holy sanctuary for a millennium before Olympian Greek mythology made it the birthplace of Apollo and Artemis, a sanctuary of Zeus. Established as a culture center, Delos had an importance that its practically inexistent natural resources could never have offered. Nowadays, Delos preserves its uniqueness. Nowhere else on the globe is there a natural archaeological site of its size and importance. No other island hosts so many monumental antiquities from the Archaic, the Classical, and the Hellenistic periods on a territory used exclusively as an archaeological site. The island is accessible daily by boat from Mykonos, weather permitting.