Roman road station and 2-based fortress "Arzos" is located about 1 km south of the village Kalugerovo. 2_based fortress in half is crossed by the railway line. Northern of the two forts was shaped like a square with an area of about 20-23 acres. South was higher by closing an area of about 35-38 acres. Among tyhe 2 partd was a village. The walls of the fortress were wide 3 m, built of stone with mortar. On the north west corner of the castle was a circular tower. Between the two main strongholds passed diagonal the Roman road from Serdica to Adrianopolis in northwest-southeast direction. The road crossed the river on a stone bridge, 6 m wide, built of hewn granite chernoslyudest with mortar mixed with crushed brick. Between granitic series had rows of bricks.
