1. City
The city walls surrounded an almost rectangular area, with an area of about 33 ha. They were built of hewn stone blocks, which were mortared and provided with battlements at the top.
There was a gate on each side. The gates on the parallel sides were connected by two main streets (cardo and decumanus), which criss-crossed the citadel from one side to the other.
Outside the fortress walls, on another 80 ha, the Romans erected numerous monuments, private buildings and other constructions. Outside the inhabited area, the city had a "territory", where those with money retired in the summer in a kind of "villa rustica" farms, such as those in Hobita or Santamaria Orlea, but also lower-ranking settlements such as Aquae (Calan Bai) or Germisara (Geoagiu Bai), where since ancient times there were thermal baths. Emperor Trajan founded a single city, Colonia Dacica, in the province of Dacia, and his descendants built another 10 settlements with the rank of city.
The territory of the metropolis stretched from the castles of Tibiscum (Jupa), Micia (Vetel) and Bumbesti, to the entrance of the Ji in the gorge. Through Ulpia Traiana passed the imperial road that came from the Danube and connected with the north of the province at Porolissum (Moigrad).
This road, also called the Roman road, has been preserved until today, and the portion between Sacel - Barasti and Santamaria Orlea is the straightest road you have ever seen, stretching over a length of 6 km, now fully paved (the authorities say that to be better preserved?!). So be it!
History also records the erection in 118 of a monument dedicated to Emperor Hadrian, in 172 another to Marcus Auraelius, and in 250 a bronze statue in honor of Traianus Daecius was erected. In the 3rd century, Auraelian Emperor Auraelius ordered the withdrawal of the Roman army from Dacia (271). Most of the population remained in the area. The life of the city did not end with the invasion of the Huns and other migratory peoples, the Roman amphitheatre being used for centuries (4th-6th centuries) as a fortress against their attacks by barricading its gates.
In the Middle Ages as well as in the following historical periods, in the Sarmizegetusa area a lot of stone from Roman ruins was used as building material. This is found in several churches in the area such as Densus, Ostrov, Pesteana, Santamarie Orlea.

















