In the interwar period (1918-1939) the peak marked the Polish - Czechoslovak border and numerous skirmishes took place in the area. Officers of Polish Border Patrol fought rebels from Organization of Ukrainian Nationalists, who on the Czechoslovak side kept numerous hideouts, with guns and ammunition. The rebels were supported by Czechoslovak, and then, in the late 1930s - by the German government.
On the peak of Pop Iwan, Polish government built in the years 1936-1938 an impressive construction - Astronomical and Meteorogical Observatory, which was commonly called “Bialy Slon” (“White Elephant”). Today, the construction is in ruins.