Tiermes Archaeological Site

An ancient Celtiberian and Roman city in Montejo de Tiermes, Soria, carved dramatically into red sandstone cliffs and sometimes compared to a Spanish Petra. Originally an Arevaci stronghold that resisted Rome during the Celtiberian Wars, it fell to consul Titus Didius in 98 BC. Under Roman rule it gained municipal status and prospered, with rooms, stairs, and corridors hewn directly from the bedrock topped by Roman facades. Key features include thermal baths, a sophisticated 1st-century AD aqueduct capable of supplying 20,000 people, and a 6th-century BC necropolis with astronomically aligned tombs. The site is a protected Zona Arqueologica with an on-site monographic museum opened in 1986.