Dacian Fortresses of the Orăștie Mountains

Built in murus dacicus style, the six Dacian Fortresses of the Orăștie Mountains (Romanian: Cetăți dacice din Munții Orăștiei), in Romania, were created in the 1st centuries BC and AD as protection against Roman conquest, and played an important role during the Roman–Dacian wars. Their extensive and well-preserved remains present a picture of a vigorous and innovative ancient civilization. Today, treasure-hunters sometimes search the area, as Romania lacks legislation in this domain (see Archaeological looting in Romania).

The six fortresses — Sarmizegetusa Regia, Costești-Cetățuie, Costești-Blidaru, Piatra Roșie, Bănița, and Căpâlna — that formed the defensive system of Decebalus were designated as a UNESCO World Heritage Site in 1999. All the sites are in Hunedoara County, except for Căpâlna, which is in Alba County.