Grjótagjá

Grjótagjá is a small lava tube cave near Lake Mývatn in northern Iceland, whose interior holds a silica-rich geothermal pool that was a popular bathing site for local farmers throughout the twentieth century until volcanic activity beneath the lake in the 1970s raised the water temperature to over 50°C, making bathing uncomfortable or dangerous. The cave achieved international recognition through its appearance in the television series Game of Thrones (as a scene location for Jon Snow and Ygritte), dramatically increasing visitor interest in a site that was previously known mainly to Mývatn locals. Today the water has cooled slightly to around 43–46°C — still too warm for comfortable bathing but visually extraordinary, with the turquoise geothermal pool glowing beneath the fractured lava ceiling in a scene of otherworldly geological beauty.