The waterfalls of the Slunjčica, together with the Plitvice Lakes, have not been well known for a long time due to their rather isolated position. In medieval times, the region around Slunj was known as no man's land (Latin "terra nullius"), an uncertain border region between Europe and the Ottoman Empire. Slunj later became a stronghold of the Military Frontier. The fortification of "Slovin" built by the noble Frankopan family was an esteemed secure refuge, around which the town of Slunj evolved. The fortress was destroyed in 1578 and later rebuilt. A period of increasing resettlement and economic prosperity followed the Treaty of Sistova in 1791.