Haneul Park

This guide to Haneul Park in Seoul starts with the trash: for fifteen years, unsorted household and construction waste piled up here into a mountain nearly a hundred meters tall, roughly ninety-two million cubic meters by the time the dumping stopped in the early 1990s. It follows the engineering fix that came next, over a hundred wells drilled into the mountain to draw off flammable methane gas that still heats nearby buildings today. A listening tip: climb the wooden steps slowly, you're walking straight up through it.