of Caras-Severin, a complex structure estimated to be 2,000 years old belonging to the Roman culture, local media reported on Thursday.   Zăvoi is a commune in Caraş-Severin County , western Romania with a population of 4,343 people which includes 23 August, Măgura, Măru, Poiana Mărului, Valea Bistrei, Voislova and Zăvoi