Dating back to the sixth century, Skopje's Kale Fortress sits on the highest point in the city overlooking the Vardar River. Just steps from the Old Town, the fortress is thought to have been built during the reign of Byzantine Emperor Justinian I using yellow limestone and travertine that came from the Roman city of Skupi, which was destroyed by an earthquake. The Kale Fortress itself was also partially destroyed by an earthquake in 1963, and excavation efforts have been underway for about 10 years, having thus far unearthed woodwind instruments and clay ornaments dating back thousands of years, as well as the foundations of a 13th-century church and the largest collection of Byzantine coins ever found in Macedonia.
Today the fortress is often visited on walking tours of the city, and visitors can walk along the restored fortress walls, which stretch for 130 yards (121 meters), or climb a couple of the turrets, which provide outstanding views all around Skopje. Theatrical performances are sometimes held in the summer.
The fortress sits just above the Old Town and is within walking distance of most central Skopje hotels. Buses 2, 2a, 8, 12 and 19 stop on Gotse Deltchev Boulevard below the fortress. The entrance is off Samoilova.