Until recently, researchers believed that a 10-acre area in Spain was simply home to a number of archaeological sites, but it turns out that it’s actually a previously unknown Roman city located on an ancient road to Pamplona. Using various techniques, they located “buildings of monumental proportions,” streets, sidewalks, rudimentary sewer outlets, the remains of a public monument, and the reception room of a thermal bath with a mosaic. The city is thought to have existed between the 1st and 5th century. And it also became a medieval peasant village from the 9th to 13th centuries. We do not know what the city was called (in either time period).