Lecturers at Bonn University had set up a mock archaeological dig at a building site on campus to teach hopeful historians digging techniques. What they did not expect to find were the 2,000-year-old foundations of a building, nestled into the dense, clayish mud. While the initial discovery was made in March, it was only in the past fortnight that the team realised the foundations were from a temple from the Roman era, the floor of which was scattered with broken pottery dating as far back as 800 BC. The building, which could have been part of a wealthy country estate,...