1. Afar, Ethiopia The Afar region, a low-lying spot in northern Ethiopia, is home to two important anthropological discoveries: the famous hominid fossil Lucy and the world’s oldest stone tools. But it has several other distinctive features. Located near the meeting point of three tectonic plates (the African, Arabian, and Indian plates), the area is seismically active, with near-continuous earthquakes that can split the earth’s crust, opening long rifts. According to recent reports, a large fissure has appeared in Afar that will eventually separate the Horn of Africa from the rest of the continent. There are also volcanoes. Rising from below sea level, Erta Ale, the most active volcano in Ethiopia, erupted several times in 2005, reportedly displacing about 50,000 nomads. The Afar depression happens to be one of the hottest inhabited places on earth, especially from May to August, when temperatures can reach a dangerous 113 degrees Fahrenheit.