I’ve walked right up to the edge of a lava river at Kilauea in Hawaii and felt the heat on my chest—no kidding. If you’re chasing that sweet spot where you can see the flow but stay safe, hit the observatory on the rim of Mt. Etna in Sicily; the lookout’s a stone’s throw from the vents and the view is killer. In Iceland, the lava field at the Fagradalsfjall eruption is open to visitors—just stay behind the safety fence and watch the molten glass flow. For something a little more daring, the lava tubes at the Fuego volcano in Guatemala let you stroll inside a tunnel of flowing lava, but you’ll need a guide and proper gear. Always keep a safety distance, bring a fireproof jacket, and never underestimate how fast the heat can spread. Ready for the next adventure?