If you ever find yourself in the mountains of Guerrero during a village festival, don’t be alarmed if you see a man in a jaguar mask leaping at another dressed as a farmer swinging a whip. You haven’t stumbled into a surreal jungle nightmare — you’ve entered the world of the Tlacololeros.

In the snowy wilds of Japan's Yamagata Prefecture, where winter wraps the land in an icy hush, something eerie stirs in the Zao Mountains. As the temperature drops and the storms rage, the trees on these slopes begin to transform—until they no longer look like trees at all.