20 Unforgettable Bucket List Adventures That Will Define Your Lifetime

17. Diving in the Silfra Fissure, Iceland

Imagine drifting weightlessly in the clearest water on Earth, surrounded by colors so vivid they seem unreal. The Silfra Fissure in Iceland is the only place in the world where you can dive between two tectonic plates, the North American and Eurasian plates, which are slowly pulling apart at a rate of 2 centimeters per year. Nestled in Thingvellir National Park, a UNESCO World Heritage site, this geological wonder is fed by glacial meltwater that has been naturally filtered through underground lava rock for decades—resulting in visibility of over 300 feet. When you dive or snorkel here, it’s as if you’re floating through liquid glass, with the walls of the fissure glowing in shades of deep blue, turquoise, and emerald green. The water is frigid, hovering just above freezing year-round, but wearing a drysuit allows you to comfortably explore this otherworldly underwater canyon. You’ll glide past jagged rock formations, surreal underwater tunnels, and narrow passageways that make you feel as if you’ve stepped into another dimension. The experience is meditative yet exhilarating, offering a unique chance to swim through the very divide that separates continents and shapes our planet.