The chief interest of the antiquarian in Rome’s ruins was topographical, identifying them if possible with structures known and described in Latin literature. Attempts to picture the layout of the ancient city generated numerous maps and disquisitions, which gradually morphed into guidebooks for tourists, many of which focussed on only the ancient remains to the exclusion of the modern city. The development of tourism is one of the capital outcomes of the fascination with the ruins of Rome. There does not seem to have been any other city or site in the world that was visited for the sake of its ruins. Topographical studies were, however, hampered by their reliance on more (or in one case, less) ancient texts in which buildings and their locations were mentioned, not always reliably. It became clear in due course that the only way forward lay in archaeological excavation.