Anevsko Kale – like a lonely colossus, testifying to past greatness, 2 km northwest of Sopot rise the fortress walls of the medieval Bulgarian fortress.
Anevsko Kale – part of the family possessions of the Smilets brothers, sebastocrator Radoslav and Despot Voisil, and of the medieval town of Kopsis, which flourished in the 13th - 14th centuries. Anevsko Kale is one of the best-preserved Bulgarian fortresses, with the walls remaining to this day nearly 12 m high. Archaeologists are particularly intrigued by Anevsko Kale and excavations in the region began in 1983. The research helped archaeologists learn more about the fortification. Anevsko Kale was located on several levels. The central citadel was located at the highest point, which had the facilities needed for independent defence. The excavations showed that the fortress had a monastery complex with a church, as well as several independent churches. The fortification is also mentioned in Byzantine chronicles under the name Kopsis. This name is the analogue of the Old Slavic word Sopot in Middle Greek.