There’s enough old stuff in England that many things get overlooked. Take the several white spots in Stonehenge’s old parking lot. Drivers there had long treated them as traffic markers, when in fact they actually marked the locations where Mesolithic wood posts once stood, thousands of years before the region’s main attraction rose from the Salisbury Plain, some 5,000 years old itself. Now, another monumental site has been discovered in the area, and though it’s much, much bigger than Stonehenge, it’s easy to see why it’s been missed for so…