Delos sits near the heart of the Cyclades, a small outcrop of granite barely five square kilometers in area. Before Greek mythology named it the birthplace of Apollo and Artemis — twin children of Zeus and the Titan Leto, who supposedly gave birth here when no other land would receive her — the island had already been sacred for a millennium. The three conical mounds visible from its Sacred Harbour suggest a goddess-cult older than the Olympians. Mount Cynthus, rising at the island's center and retaining its pre-Greek name, was crowned with a sanctuary to Zeus. Delos was holy ground long before anyone could say precisely why.

By 900 BC the island had become a Panhellenic sanctuary — a gathering place that transcended the political rivalries dividing Greek city-states. The Delian League, founded in 478 BC after the Persian Wars, held its congresses in the temple and kept its common treasury here until Pericles removed the funds to Athens in 454 BC. Ancient Greeks used a proverb for someone light-hearted and happy: 'You sing as if sailing into Delos.' The island carried that kind of weight.

Athens performed a series of ritual cleansings of the island across the centuries, each more drastic than the last. The tyrant Pisistratus, in the sixth century BC, ordered all graves within sight of the temple dug up and the bodies relocated. A century later, during the Peloponnesian War, an oracle from Delphi demanded a complete purging of the dead from the entire island. The decree that followed was sweeping: no one could be buried on Delos, no one could give birth there. The ban was practical as well as sacred — with no birthright inheritance possible, the island's political neutrality in commerce was guaranteed.

Four years after that purification, the Athenians took the final step: every remaining inhabitant was relocated to Adramyttium in Asia Minor. The island's permanent residents became, in effect, its absence.

The Romans converted Delos into a free port in 166 BC — partly to damage the trade of Rhodes, then a target of Roman hostility. What followed was an economic explosion. Roman, Phoenician, Samaritan, and Italian merchants all set up shop on an island that grew no food, produced no timber, and generated nothing except transactions. Everything was imported; money was the only crop.

At its height, Delos was one of the largest slave markets in the Mediterranean. Tens of thousands of people — captured by Cilician pirates, or taken in the wars that followed the collapse of the Seleucid Empire — passed through here as merchandise. The Establishment of the Poseidoniasts, a clubhouse for Beirut-based merchants, shipmasters, and warehousemen, honored a syncretic trinity that merged Phoenician and Greek gods: Baal with Poseidon, Astarte with Aphrodite, Eshmun with Asclepius. The island's cosmopolitanism was real, and it had a cost that was borne by those who were not free to benefit from it.

The most iconic image of Delos is a row of marble lions facing the Sacred Way — snarling, haunched, alert. The people of Naxos dedicated them to Apollo shortly before 600 BC. Originally there were nine to twelve; seven remain in their original positions today, though the survivors standing outdoors are replicas, the originals preserved inside the museum. One was removed long ago and now sits above the main gate of the Venetian Arsenal in Venice.

Elsewhere on the island, a colossal kouros of Apollo — its torso and pelvis still in place, its hand in the local museum, its foot in the British Museum — speaks to the scale at which the ancient world honored this place. The House of Dionysus preserves a brilliant second-century floor mosaic of the god riding a panther. The House of the Dolphins shows erotes astride dolphins in tesserae still vivid after two millennia. These were not temples but private homes, their floors testifying to the wealth Delos channeled before Mithridates VI of Pontus attacked the island in 88 BC and again in 69 BC, after which its commercial life never fully recovered.

UNESCO added Delos to the World Heritage List in 1990, recognizing it as a site that 'conveys the image of a great cosmopolitan Mediterranean port' and documents the development of Greek architecture across centuries. The ongoing French-led excavations are among the most extensive in the Mediterranean. The sacred lake — now kept intentionally dry to suppress malaria-carrying mosquitoes — still holds its circular bowl. The Minoan Fountain, hewn from rock in the sixth century BC, still fills with water from the spring below.

The 2011 census counted 24 inhabitants on the island, all caretakers. Visitors arrive by boat from Mykonos, a short journey across water, and must leave before dark. No hotels, no overnight stays. The prohibition against dying here, it turns out, is still being honored — just differently than the ancients intended.