The city of Amsterdam recently built a massive metro line that crossed the historic city from north to south (from Nieuwe Leeuwarderweg to Europaplein), connecting the two regions of the city that are divided by the IJ, a former bay. Between 2003 and 2015, a team of archeologists had the opportunity to excavate over 700,000 objects that lay beneath the River Amstel, which was drained as part of...