Rupea Citadel is one of the oldest archaeological sites in Romania, the first signs of human settlements dating from the Paleolithic and early Neolithic (5500 BC–3500 BC). Archaeological investigations have revealed objects from this era, testimony of settlements in the region: stone tools, pottery, funeral urns, etc. In Dacian times, on these places was raised the dava known as Rumidava or Ramidava (after various historical sources); conquered by the Romans, Rumidava becomes the Roman castra Rupes (in Latin, rupes means "rock" or "stone"). The Roman castra Rupes was part of the Roman fortification belt defending the commercial area and routes linking Valea Târnavelor, Valea Oltului, Râșnov and Hoghiz.
In 1990s, Rupea Citadel was in ruins. Local authorities have decided to seek EU funds for the rehabilitation of the citadel and invested 32 million lei in restoring the historical monument.
Pictures from inside in this http://touristinromania.net/what-to-visit-romania/rupea-fortress-romania/