The Stone Cairn.
A cairn site has four main purposes. The first is the marking of a grave or in memory of a loved one in their passing. The second is its use by climbers as a symbol of their success in reaching of the summit of a mountain. Thirdly, it a cairn is used as a form of a path specifically across glaciers or barren, stony terrain. Lastly, a cairn has been used as a sea marker to help mariners determine their location. Original public domain image from Flickr