The archaeological excavations in "Kalyata" area starts in 2013.

First information about the fortress is from the Byzantine chronicler Kedrin /end of XI - begg of XII century AC, which notes: "Sitan is a remarkable city ...". The fortified village is situated on 1300m. altitude on the territory of Pirin National Park, 3.5 km. south of Bansko. It is built on a hill, surrounded by almost vertical slopes. Covers an area of about 10 acres. A part of the eastern and northern wall with the citadel gate is revealed, which are made of processed limestone stones, sealed with mortar and are 1.80-2.00m thick.

In the northeastern corner a circular security tower is built. There are many fragments of ceramics, glass, iron objects, ornaments and more. According to the coins found so far, it can be asserted that the settlement was inhabited for the period III - XIV c. Most of them are exhibited in the Historical-Ethnographic Complex "Radonova kashta" in Bansko.