The Domleschg is strategically positioned on the route to three main Alpine passes: the Splügen Pass, the San Bernardino Pass and the Julier Pass. To control this route, castles were built, making the Domleschg one of the Swiss regions richest in castles. From north to south, they are Hochjuvalt and Innerjuvalt in Rothenbrunnen, Ortenstein in Tomils, Hasensprung in Pratval, Old Süns and New-Süns in Paspels, Rietberg in Pratval again, Heinzenberg Castle in Präz on the left bank, Baldenstein in Sils and Campbell, Ehrenfels Hohenrätien and Obertagstein above Thusis.