Hillfort of el Cerro de la Mesa Nature · Alcolea de Tajo, La Campana de Oropesa, Toledo Image of Alcolea de Tajo, not of the place itself. The site of a Celtiberian hill fort of the 6th and 5th centuries BC on the Cerro de la Mesa, one of the most important archaeological complexes in the comarca. Photo: 19Tarrestnom65 (CC BY-SA 4.0) What to see and do in Alcolea de Tajo