Gjáin in Þjórsárdalur Valley is a hidden gem in upcountry Iceland, known for its lush vegetation, beautiful waterfalls, and unique lava formations. This fairyland oasis can be reached by an easy hike from the Viking settlement manor at Stöng, where visitors can marvel at the stunning Gjárfoss waterfall and explore the rocky terrain filled with lava caves and columnar basalt. With its magical charm and Game of Thrones filming location status, Gjáin is a must-visit destination for nature lovers looking to experience Iceland's natural beauty at its finest.