Sorry, generic bus tours—it's time for *actual* adventure. On this tour, you'll go full-on Indiana Jones, making an adventurous descent inside the remains of Iceland’s dormant Thrihnukagigur volcano. You'll traverse the surreal landscapes of Iceland’s countryside on your way to the Blue Mountains, hiking through the area’s craggy lava fields. Then, you'll follow your guide inside the geological site's immense subterranean interior, its walls still scalded from an eruption that took place 4,000 years ago.