Raufarhólshellir

[2] The cave hosts microbial mats containing a variety of microorganisms, including actinomycetota and acidobacteriota.

[3] The land containing the cave is owned by the Seventh-day Adventist Church and rented to a company that operates the guided tours.

[3] The source of the lava flow that created the tube is 10 kilometres (6.2 mi) uphill from the cave and was part of the Leitahraun eruption.

[5] Prior to 2016, it was freely open to the public, but it closed late that year due to concerns with garbage accumulation, damage to the cave, and the cost of rescuing visitors.

[1] In June 2017, two concerts were held in the cave as part of the Secret Solstice music festival, which included a performance by Helgi Björnsson, for which only 50 tickets were available.