Sliding tracks on the Island of Bornholm, Denmark. A recently recognized ancient monument class

Abstract

A distinct ancient monument type, though of uncertain date, in the Baltic Sea Island of Bornholm, is described and discussed. On a number of granite rocks deliberately polished courses lead down a slope at a steep angle. The length of these shiny, polished surfaces varies from about 2 m to 10,4 m. The widths do not vary much, with an average at about 35 cm. Seven Bornholm surviving examples of these sliding tracks are presented, recorded in 2023, 2024, and Hammeren in 2025. In two cases, Klintebakken and Slamrebjerg, a sliding track is still in regular use. In other cases, information has been obtained regarding their use during the last 150 years. Seeking explanations for this distinct phenomenon, folklore evidence may connect the past with the present, suggesting fertility magic. However, a customary use just for fun, children’s games, is well recorded.