roosaurusrin:Lava River Cave near Flagstaff, Arizona. This lava tube was likely formed through a ven
roosaurusrin:Lava River Cave near Flagstaff, Arizona. This lava tube was likely formed through a vent from a nearby volcano. The outer edges of the flow solidified, leaving the inner lava to flow out and leave a vacant space. It is around a mile long, and the temperature was near freezing when I explored it.Kairns (rock towers usually used as markers) had been built at the very end of the tunnel. The last two pictures are of the entrance to the cave. -- source link
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