The Þríhnúkagígur crater

The Þríhnúkagígur crater (or Thrihnukagigur Volcano Cave) is one of the world's most unique volcanic caverns and is one of the Most Beautiful Caves in Iceland. It was formed roughly 4,000 years ago, however, the volcano has not erupted since the cave's construction. This magma chamber is one of the world's most unusual geological formations.

The huge magma chamber beneath Rhnkaggur was found in 1974 by an Icelandic cave explorer. Its discovery made international headlines because volcanologists had never seen anything like it before and were battling to explain its existence. It was opened to tourists in 2012. An elevator, similar to those used in mining, was installed, and tourists were now permitted to join tours of the mine's depths. Its popularity stems not only from the tour's originality and the size of the chamber but also from the stunning coloration within it. Mineral deposits color the walls vibrant colors of red, yellow, green, and blue, adding to the ethereal quality of the amazing area. Reaching Þríhnúkagígur necessitates a short but uphill climb that may be completed by anyone who is solid on their feet and has a reasonable degree of fitness. Tours are only available throughout the summer.

Location: Hafnarfjordur, Iceland