Dallol in Ethiopia is not only the hottest inhabited place on Earth, it's also one of the weirdest. Between 1960 and 1966, the average annual temperature was a toasty 35°C (96°F), but the temperature can regularly creep to over 46°C (115°f).
At 48 metres below sea level, Dallol is Earth's lowest land volcano, and its last recorded eruption was in 1926. Its craters contains hot springs that boast a whole range of otherworldly colours - including neon yellow - thanks to the hot magma bubbling below the surface. This magma heats the groundwater that flows into the area from the nearby highlands, and as the heated groundwater moves up towards the surface, it dissolves salt, sulphur, potash and other minerals and deposits them in the Dallol craters.
Source: http://www.newscientist.com/article/dn2013-the-universe-is-not-turquoise--its-beige.html#.U9-y36PqySp
