In 2018, excavations revealed the remains of massive terraced walls and giant gleaming structures on a tiny islet that was once attached to Keros. The structures were built using 1,000 tons of stone, turning the headland, which measures just across, into a single, giant 'pyramid'. Beneath the pyramid, researchers found evidence of a complex drainage tunnels and traces of advanced metalworking. The researchers say the remains make the island one of the most impressive archaeological sites of the Aegean Sea during the Early Bronze Age. The excavations show that the headland of Dhaskalio, which was once attached to Keros but is now a tiny islet because of sea level rise, was almost entirely covered by remarkable monuments.