Liškiava Sacred Mound (Church hill) is separated from the castle hill by a ravine 17 m deep. On the Church Hill in the second half of the fifteenth century, there was a wooden church that burned down in the mid-sixteenth century but was rebuilt and stood for about 100 years. When the church fell, in the seventeenth century, a 150 m-long hill in the southeastern and western part built palaces that belonged to M. Pranskevičius-Radziminskas. In the early eighteenth century, the palace burned down. During archaeological research, foundations were found, a 3 m-wide pavement of dotted stones around the parked church, stained glass remains, Alexander's decks, John Casimir's coins, ringed ceramics, graves and their remnants. The findings are stored in the National Museum of Lithuania. From the south, the hill is surrounded by Nemunas, into which the Krūčius river flows from the eastern side of Sacred Mound, while the Valley of the Beast stands on the northeast side.