Truvorovo, also known as the Old Izborsk Hillfort, is located on Zheravye Mountain and was inhabited by the Krivich tribes in the 7th-8th centuries. Today, it is an archaeological site where artifacts of local and Finno-Ugric cultures and lifestyles are found.

The hillfort is situated at the tip of an island, on the Gorodishchensky Cape above the lake. The first Izborsk fortress was built here, which was later moved one and a half kilometers to its current location. The area of the hillfort is about 1 hectare and rises about 45 meters above the lake. The cape, elevated above the basin, was strategically advantageous: the lake protected it from the east, while a ravine provided defense from the north and west. Construction of the fortress began on the open southern side. To this day, remnants of a moat and a semicircular stone-earth embankment have survived. Behind them were wooden residential buildings, with the main square of the settlement located on a limestone slab at the center.

At the entrance to the hillfort, ancient burials can be seen. Among them, two stone slabs with geometric symbols carved into the limestone stand out. There is no consensus on the purpose of these markings: one version suggests they served as construction signs and symbolized the sacred temple of Babylon, a ziggurat. Another version proposes that the slab with markings was used as a game board for the medieval 'mill', an analogue of modern board games.

However, more attention is drawn to the so-called Truvor Cross, set on one of the slabs. This limestone sculpture is in the shape of a Christian cross with ends resembling the blade of an axe. The cross bears the inscription 'King of Glory, Jesus Christ Nika', characteristic of crosses in northwestern Rus. Legend has it that this cross marks the grave of Truvor, who was called to rule Rus in 862. Although the sculpture was created at the turn of the 14th and 15th centuries, the burial beneath it may be much older.