There are old pine trees on top of Kätkävaara with various wooden signs carved on them. These pines are hundreds of years old and can be found in the very highest areas of hill.
The explanations and meaning of the signs are a mystery to the inhabitants of the locality, but they are supposed to depict some already forgotten folk tradition through various symbols. The images can also be ancient carved signs of sacrificial trees by Lapps who grazed their reindeer in the area.
Wooden signs were used as a signature and to mark property before writing became more common. The carved wooden signs in the trees of Kätkävaara are the signs of the houses in the village of Runkaus. However, the purpose of these signs has not been clarified. Signs appear at the same height in old trees north of Kätkävaara.