The Rokantiškės Lowland Hillfort is also known as the Castle Hill. Long ago, an old and beautiful castle stoop atop the high and steep mountain (35–40 m in height) in Rokantiškės. Researchers believe that the Castle of Rokantiškės is one of the oldest castles in Lithuania. According to the legends and old chronicles, the castle was built by Duke Alšis in the 12th century. The castle belonged to the Goštautas family in the first half of the 16th century, was later passed on to Sigismund II Augustus and later on given to the Pac family in the first half of the 17th century. The steep slopes of the mountain were a natural defense from the enemy and the good geographical position of the castle also helped defend against any sieges. The lowland hillfort is surrounded by the Vilnia River Vvalley from the north and the east and by a deep depression in the west. The back of the hill at the south connects to other hills and has the only road leading to Strielčiukai Village which was occupied by archers defending the castle in the ancient times. Presently, the castle mountain is brought to order and adapted for sightseeing. Beautiful vistas of the nearby areas, the hills and the settlement of Naujoji Vilnia can be seen from a top.