Trnje is the site of two known mass graves associated with the Second World War. The Tiček Cave Mass Grave (Slovene: Grobišče Tičkova jama) lies north of the village, in a shallow karst valley on the east side of Lake Petelinje (Petelinjsko jezero). It contains the remains of undetermined victims based on human bones found at the site by spelunkers.[4] The Shaft 1 by the Muha Enclosure Mass Grave (Grobišče Brezno 1 pri Muhovi ogradi) lies 2 kilometers (1.2 mi) northeast of the village. It was excavated in October 2009, revealing 37 victims and eight German military ID tags. The remains were reburied in December 2009 in Block F of the German military cemetery in Celje.[5]
Church
The parish church in the settlement is dedicated to the Holy Trinity and belongs to the Koper Diocese.[6] It was built in 1895 in the neo-Romanesque style based on plans by the architect Raimund Jeblinger. It stands on a small hill south of the village.[7]
Recreation
The village offers farm tourism[8] and a riding school.[9]
^Ferenc, Mitja (December 2009). "Grobišče Tičkova jama". Geopedia (in Slovenian). Ljubljana: Služba za vojna grobišča, Ministrstvo za delo, družino in socialne zadeve. Retrieved November 4, 2023.
^Ferenc, Mitja (December 2009). "Grobišče Brezno 1 pri Muhovi ogradi". Geopedia (in Slovenian). Ljubljana: Služba za vojna grobišča, Ministrstvo za delo, družino in socialne zadeve. Retrieved November 4, 2023.
^"4078: Trnje - Cerkev sv. Trojice" [4078: Trnje – Holy Trinity Church]. Register nepremične kulturne dediščine [Registry of Immovable Cultural Heritage] (in Slovenian). Ministrstvo za kulturo Republike Slovenije. Retrieved 19 August 2014.