Yesterday I went for a short hike in Tyresta National Park to the south of Stockholm. It’s a place that I regularly go to in order to escape the city and explore the park’s old-growth forest (or urskog) — one of the few and finest remaining in southern Sweden. Some of the pines here are four centuries old, having never been exploited by modern forestry, which elsewhere has turned many of the country’s forests into plantations lacking the diversity, character, and age of more undisturbed woods. The photo below is of one of the park’s most recognizable ancient pines. Growing at a 30-degree angle, it’s a wonder that it hasn’t toppled over.