Cairn is not only the road sign of hikers (pointing to stone can be used as a guide), but also an aesthetic attraction. Cairn seems to be everywhere. They are everywhere in national parks, on gravestones in cemeteries, under statues in religious places.

Creating your own Cairn may be attractive when traveling, but sometimes it's not a good idea: a cairn that puts the wrong place can get hikers off the road.

Cairn is also used as a symbol of amulet and belief. Cairn not only reflects the ancient geological time, but also contains a short human time, which is a profound relationship.

Source: @slowrender