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.

Somewhere in the vibrant chaos of Tepito — one of Mexico City’s most notorious neighborhoods — there’s a quiet corner that draws people in like a spiritual magnet. Candles flicker, skulls glimmer in the dim light, and offerings of tequila, cigarettes, and candy pile up around a robed skeletal figure. This is La Santa Muerte, the “Saint of Death,” and she’s unlike anything you’ve seen in a Catholic church.