Planinski vrh, German: Planiner Anhöhe),[3] formerly considered to belong to Planina, is now part of neighboring Postojna.

[5] The Planina area was already settled in prehistoric times, along a trade route from Šmihel pod Nanosom to Vrhnika.

Medieval Planina developed around a castle belonging to the lords of Alben (Slovene: albenski gospodje).

After the First World War, the Treaty of Rapallo split the town: the hamlet of Kačja Vas, the source of the Unica River (at the mouth of Planina Cave), the Ravbar Tower of Little Castle, and Haasberg Castle lay on the Italian side of the border.

[6] The Partisans also burned the Windischgrätz archive and destroyed the nearby family crypt and castle park.

The Liplje Cave Mass Grave (Slovene: Grobišče Lipeljska jama) is located on the slope of Mount Planina (Planinska gora), northeast of the peak.