Concierge.com's insider take:
The Doric temple of Segesta, about an hour's drive from Palermo, is one of the world's most magical ancient sites. Set on the edge of a deep canyon amid wild, desolate mountains, this huge, 2,500-year-old temple was never finished. On windy days, its 36 giant columns are said to act like an organ, producing mysterious and beautiful notes. The people of Segesta, the Elymians, claimed they were descendants of the defeated Trojans, and built a massive hilltop theater in Greek style above the temple. How it has survived 2,500 years of foreign invasions and earthquakes (it is situated in one of the most seismically active zones in Europe) is a puzzle. You'll need at least half a day to walk in and around the temple. The best view is from the hillside on the opposite side of the canyon, although this requires a 30-minute walk uphill.