4K views · 262 reactions | Geysers and glaciers and volcanoes, oh my: Hike, climb, and Zodiac your way around the out-of-this-world landscapes of Iceland. | National Geographic Expeditions | Facebook

Yellowstone’s geysers are breathtaking but incredibly dangerous. The water in these geothermal features can exceed 400°F (204°C), hot enough to cause instant third-degree burns. The ground around them is often just a thin crust covering scalding, acidic water, and several people have died after falling through. In 2016, a man slipped into a hot spring, and his body was completely dissolved within a day. Steamboat Geyser, the world’s tallest active geyser, can shoot boiling water 300 feet into th