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The summer solstice at Stonehenge became a pilgrimage for present-day druids and other modern visitors in the 1870s. In 1905, the Ancient Order of Druids first recreated Druidic practices to celebrate the longest day of the year. The celebrations grew until 1985, when 30,000 pilgrims attended a celebration that ended in a violent confrontation with police. This resulted in a ban on summer solstice visitors that lasted until 2000.
Could the builders ever have imagined seeing their site from Google Earth? (Well, possibly, if aliens really did pitch in.)