The easiest lava tube to visit, and the largest in Iceland, 1100-year-old, 1.5km-long Viðgelmir is located on private property near the farmstead Fljótstunga. It sparkles with ever-changing rock formations and has a stable walkway within it on which tours are conducted. Check the website for tour times; helmet and torch included.
Viðgelmir – the Cave
Top choice in Borgarbyggð
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