The assembly of the Dacian fortresses is composed of six monuments located in the Orastiei Mountains, to the south of the Orastie town, which have been registered in the patrimony of UNESCO. Even if the access is more difficult, the ruins of the fortresses are worth the effort.
- Banita Fortress is located on an isolated cliff edge, called the Disease Hill (Dealul Bolii) or the Fortress’ Rock (Piatra Cetatii) (902 m), only several km to the west of the Petrosani town.
- Costesti-Blidaru, a fortress from the 2nd century B.C. (year 106), used to be the permanent residence of the Dacian king Burebista. The fortress has two adjoining enclosures, with walls built of chalk blocks.
- Capalna, a Dacian fortress located on the "La Cetate" cliff, 610 m high.
- Costesti-Cetatuie is an old fortress with defense towers, located on the Cetatuia Hill, 561 m high.
- Luncani-Piatra Rosie, of the Bosorod village, is a Dacian fortress made of stone, with five towers and a gate dating back to the 1st century B.C. and the 1st century A.D. After the Dacian-Roman war in 106, it was destroyed. Currently, an iron sword of Celtic origin, the shell of a parade shield and a bronze candelabrum have been discovered.
- Sarmizegetusa Regia, the former political, administrative and military center of the Dacian state at the end of the 1st century B.C. and the beginning of the 1st century A.D. It is one of the largest refuge fortresses in Transylvania. Its plan is polygonal, it has stone walls with two gates and several terraces arranged. Near the fortress there is a complex of sanctuaries, the two of them being connected to a paved alley, called "Via sacra".