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.

As the sun sets on November 2nd in the quiet borough of San Andrés Mixquic, the local cemetery begins to glow. Hundreds of candles flicker to life. Marigold petals form glowing pathways. The air is thick with the scent of copal incense and tamales. But this is no ordinary cemetery visit — this is a sleepover with the dead.