Fort I "Salis Soglio" is a key part of the Przemyśl Fortress, one of the largest fortification systems in Europe, located near Przemyśl, Poland. Built in the late 19th century, the fort was named after Swiss engineer Baron Daniel Salis-Soglio, who played a major role in expanding the fortress between 1878 and 1883. During World War I, it was initially captured by the Russian Army but later retaken by German forces in mid-1915. After the war, the fortifications lost their military significance and gradually fell into disrepair. Today, the remains of Fort I "Salis Soglio" serve as a historical site, offering insight into the region’s military past and attracting visitors interested in historical fortifications.