Vatnshellir Cave, located in the Purkhólahraun lava field, is a fascinating lava tube in Snæfellsjökull National Park. With its unique formations like lavacicles and lava straws, the cave offers a glimpse into Iceland's volcanic history. Accessible only with a guide, the cave provides an educational and awe-inspiring experience for visitors looking to explore the underground wonders of this ancient lava tube.