What could be cooler than a permanent lava lake surrounded by snow!?

The Mount Erebus Volcano Observatory: http://erebus.nmt.edu/

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Sources:
http://www.livescience.com/45038-erebus-lava-lake-cycles-revealed.html
http://volcano.si.edu/volcano.cfm?vn=390020
http://www.atlasobscura.com/places/mt-erebus
http://link.springer.com/article/10.1007/s00445-015-0941-z
https://community.dur.ac.uk/ed.llewellin/papers/Witham_Llewellin_2006_JVGR.pdf
http://www.sciencedirect.com/science/article/pii/S0012821X14001848
http://www.sciencedirect.com/science/article/pii/S0377027315003650
http://www.sciencedirect.com/science/article/pii/S037702731500044X

Images:
https://commons.wikimedia.org/wiki/File:Emerald_Bay.jpg
https://commons.wikimedia.org/wiki/File:Lava_Lake_Nyiragongo_2.jpg
https://commons.wikimedia.org/wiki/File:Mt_erebus.jpg
https://commons.wikimedia.org/wiki/File:RossIslandMap.jpg