(Source: rubberbaby)
(Source: tay-disco-rayado)
(Source: monkey-bat-lemur)
Ice cave with arctic algae, El Malpais National Monument, New Mexico. This lava tube is an active ice cave with a layer of arctic algae on the top. Ice goes down 20 feet deep now, but at one point in the 1940s ice miners carved it down to 12 feet.
Photo credit: Stephanie Fitzgerald