With the easiest access from Valea Streiului – Orăștie is the Dacian fortress from Costești-Cetățuie.
The road on the valley can hardly miss the intersection to the fortress area, but this was also true at the time of its construction, which facilitated not only the lightest supply of construction material (the stone blocks here are the largest of all the fortifications in the Șureanu Mountains),
but also the expansion of the fortified area.
The blocks exposed to the sun, rain and snow have taken on grey hues, but under a small crust they reveal the same wonderful world of creatures that lived tens of millions of years ago,
of the troubled sea shore that formed oolithes around grains of sand or empty shells. Or maybe just sand gathered on the shores of the former Sarmatian Sea in the Hațeg Basin,
strengthened by millions of years of diagenesis and then shaped into blocks by people sitting on guard at the borders of empires. And so, the oolitic, fossiliferous or clastic limestones, found in the historical exploitation fronts from Măgura Călanului or maybe in other places also (still uncertified), have remained as evidence for the constructions of the murrus dacicus walls and the residential towers, in this site near Dacian capital Sarmizegetusa Regia.
