The southern gate, Hisarya

Many Roman ruins are visible everywhere — public buildings, a small amphitheatre, the barracks of the Roman garrison, the foundations of a couple of the oldest churches in Bulgaria, as well as the best-preserved Roman fortress in Bulgaria. The southern gate is known as 'The Camels', because it had broken in the middle and looked like two camels facing each other, before it was partially restored in the early 20th century.