Apulum was a legionary fortress in the Roman province of Dacia from the 2nd to 4th centuries AD, located in today's Alba Iulia, Romania.
It is the largest castrum in Romania, occupying 37.5 hectares. It was the base of the legion Legio XIII Gemina transferred there by Trajan to the newly conquered province of Dacia at the end of the war in 106. In the era of Hadrian and of Antoninus Pius it was rebuilt in stone.
The city of Apulum grew up around the fortress, eventually becoming the capital of Roman Dacia.
Wikipedia https://en.wikipedia.org/wiki/Apulum_(castra)
Address 13 Strada Unirii, Alba Iulia 510009, Romania
Coordinates 46°4'5.912" N 23°34'23.4" E
