The mountain range Kverkfjöll is situated on the north-eastern border of the glacier Vatnajökull in Iceland. With their glacier Kverkjökull, they are to be found between the Vatnajökull and the Dyngjufjöll. The mountains are still active volcanoes. Especially around 1720, they were often erupting and causing glacier runs.
Under the mountains, there is a very large, very hot magma chamber which leads to the originating of glacier caves. Currently, they cannot be visited because of the risk of collapse. There is a warning sign at the "parking place" near the caves.
In a certain distance, there are the hot springs of Hveradalir.
Open 24/7.
Free admission.
Wikipedia https://en.wikipedia.org/wiki/Kverkfjöll
More information on showcaves.com http://www.showcaves.com/english/misc/caves/Kverkfjoell.html
Address Iceland
Coordinates 64°43'17.156" N -16°39'22.094" E