Grjótagjá, Thermal cave in Skútustaðahreppur, Iceland
The lava cave contains a natural hot spring with clear blue water surrounded by dark volcanic rocks at the entrance and ceiling.
During the 18th century, outlaw Jón Markússon established his residence in this cave, utilizing the thermal spring for bathing and survival.
The cave gained international recognition after appearing in Game of Thrones season three, where it served as the filming location for Jon Snow's storyline.
Swimming in the cave is prohibited due to temperature fluctuations caused by volcanic activity, which can reach dangerous levels above 50 degrees Celsius.
The geothermal waters inside the cave maintain different temperatures at various depths, creating visible layers of thermal stratification through the clear water.
Location: Þingeyjarsveit
GPS coordinates: 65.62716,-16.88168
Latest update: May 17, 2025 23:34
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