Ngorongoro Conservation Area does not only generate interest purely based on wildlife. This area also has arguably the most extensive history of any place on earth. It has been proved that various Hominid species have lived there for millions of years. This is because of fossils which were discovered preserved in volcanic rock dating back to 3.6 million years ago. Olduvai Gorge is a steep-sided ravine in the Great Rift Valley. Olduvai gorge is one of the most important prehistoric sites in the world and has been instrumental in understanding human evolution. This fact is well documented in the museum onsite and which boasts of replicas of some of the hominid fossils unearthed at the site as well as the Laetoli footprints (the most ancient footprints ever found). Additionally, there are found genuine fossils of some of the extinct animals that used to live in the area.