Name: Thríhnúkagígur, or Three Peaks Crater
Location: Southwest Iceland
Coordinates: 63.9984, -21.6989
Thríhnúkagígur is a dormant volcano located near Reykjavík. Its last eruption happened around 4,500 years ago, creating a unique hollow magma chamber inside. This chamber stands out as the only accessible magma chamber in the world, allowing visitors to step into a volcanic environment.
Since 2012, tourists can use a cable elevator to descend into this cavern. The journey takes them down about 700 feet (210 meters)—that’s more than twice the height of the Statue of Liberty! Once inside, people can explore a 33,600-square-foot cave floor filled with colorful mineral deposits.
Usually, volcanoes have filled magma chambers, but Thríhnúkagígur is different. Researchers are still trying to understand why. They believe that the magma from the last eruption may have drained back into the Earth. “It’s like somebody came and pulled the plug,” says Haraldur Sigurdsson, a volcanologist from the University of Rhode Island.
Inside the chamber, vibrant colors like bronze and indigo catch the eye. These colors come from an interaction of sulfur-rich gases and microbes that thrive in this unique environment. Sometimes visitors spot steam, but it’s just water dripping onto lamps, not a sign of an imminent eruption.
Thríhnúkagígur has a fascinating history, having erupted three times in the last 50,000 years. The name translates to “Three Peaks Crater,” reflecting its three surface peaks that stand about 115 feet (35 m) tall and about 660 feet (200 m) apart. The youngest peak formed during the last eruption, while the oldest dates back to when Iceland was covered by a thick ice sheet.
Current research shows that while Thríhnúkagígur is located on the Mid-Atlantic Ridge—where two tectonic plates pull apart—it’s unlikely to erupt soon. This stability allows it to be a safe destination for adventurers looking to witness the raw power of nature from within.
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