Slope is the site of a mass grave associated with the Second World War. The Kotar Enclosure Cave Mass Grave (Slovene: Grobišče Jama pod Kotarjevo ogrado) is located in a woods northeast of Tublje pri Hrpeljah. It contains the remains of 15 to 17 people, probably German soldiers and Slovene civilians.[4]
^Ferenc, Mitja (December 2009). "Grobišče Jama pod Kotarjevo ogrado". Geopedia (in Slovenian). Ljubljana: Služba za vojna grobišča, Ministrstvo za delo, družino in socialne zadeve. Retrieved October 11, 2023.