Iceland features stunning waterfalls of all sizes and descriptions, but at Seljalandsfoss, in South Iceland, you can actually walk behind the curtain of water. At the Silfra Fissure in Þingvellir National Park, you can snorkel or scuba dive in the crack between the North American and Eurasian continents. Fed by Langjökull glacier, the water in the fissure is famously clear, with exceptional visibility. Take a cable car into the massive magma chamber of the volcano
Þríhnúkagígur – the only place in the world where this experience is possible. Don’t worry – it’s been dormant for 4,000 years. Natural hot springs are everywhere in this geothermal country, and if you’d prefer to soak in solitude
rather than among the throngs at the Blue Lagoon, head to the secluded Lanbrotalaug spring on the Snæfellsnes Peninsula or Hörghlíðarlaug, overlooking the sea in the Westfjords.