Grjotagja Cave Bath

Grjotagja Cave Bath is a remarkable geothermal lava cave near Lake Myvatn in Northeast Iceland, where naturally heated bicarbonate spring water fills a luminescent turquoise cave pool created by volcanic activity — an extraordinary subterranean bathing experience that gained international fame as a filming location in the HBO series Game of Thrones (Season 3), where the cave's ethereal blue-lit pools served as the backdrop for a memorable scene. The bicarbonate-rich geothermal waters here, which fluctuate in temperature depending on volcanic activity in the broader Myvatn area and currently run too hot for comfortable bathing in the main cave, remain visually extraordinary even when not accessible for swimming — the cave's crystal-blue waters, volcanic rock formations, and filtered daylight creating one of Iceland's most visually dramatic natural phenomena. Located in the Myvatn Nature Baths region of Northeast Iceland — a landscape of pseudocraters, lava formations, and the lake's extraordinary bird life — Grjotagja represents Iceland's most theatrically beautiful geothermal cave system and a site where volcanic geology, visual spectacle, and cultural pop-culture heritage converge.