This 9-12th century archaeological monument was used for defence purposes in the first millennium AD. The mound complex is located in the middle section of the massive Šiliniškės Ridge. The famous Linkmenys castle, which was mentioned in the Livonia Chronicles by H.Vartberge  in 1373, stood here during the 13-15th centuries. Supposedly, the castle was ruled by Mindaugas' nephew in the 13th century. There is a stone at the top, on which there is mention of Lithuanian president Antanas Smetona’s visit here in 1934.