Witness the grandeur of Iceland’s natural phenomena on this guided tour of geological wonders and historic sites of stunning beauty. Venture up to Thingvellir National Park, see the mighty Gullfoss waterfall and Geysir hot spring, and snorkel in the crystalline depths of the Silfra fissure.

Begin among the rugged terrain and endless green fields of UNESCO-listed Thingvellir National Park, the rift valley that holds the site of Iceland’s first parliament, founded in 930 AD. Then, amble over to the world-renowned geothermal area at the Geysir hot spring, where gurgling steamy waters burst 82 feet (25 m) in the air. At Gullfoss, known as the “Golden Falls,” get up close and watch the thundering fast-flowing waters rush over 3 steps of lava layers and disappear down long, winding ridges.

Slip into your wetsuit and jump into the fresh water of the Silfra fissure, which sits above the tectonic rift where the European and American continents split apart. Hover in some of the clearest water in the world, allowing you to gaze along a giant lava field and endless sprawling glaciers.

From behind your snorkelling mask, get inches away from jagged rock formations and luminescent algae in this magical sub-aquatic world. After surfacing and warming up, head back to your hotel, where you can explore Iceland even more—on land.