The small island of Delos, just 3km (2 miles) offshore from Mykonos, was considered by the ancient Greeks to be the holiest of sanctuaries, the sacred center around which the other Cyclades circled. Delos is known locally as the "brightest" island in the Cyclades, a tradition that seems to indicate both its continued significance as a sacred place and the fact that this is one place where you'll need sunglasses. It is unquestionably one of the most remarkable archaeological preserves in the world, displaying ample evidence of its former grandeur. Always a place set apart, Delos had rules different from those of neighboring islands; in ancient times, people were not allowed to die or be born on this sacred island. Today, they are not allowed to spend the night, and the site can be visited only between the hours of 8:30am and 3pm, and not at all on Monday.
We recommend visiting Delos as early as possible in the day, especially in summer, when the crowds and heat become overwhelming by early afternoon. Sturdy shoes and water are necessary; a hat, sunblock, and food are also advised. There is a cafe near the museum, but the prices are high, the quality poor, and the service even worse.