Olduvai, more accurately called Idupai after the wild sisal in the area, is the site of some of the most important fossil hominid finds of all time – Nutcracker Man – or Australopithecus Boisei who lived 1.75 million years ago. The history of the gorge and the work of Louis and Mary Leakey is chronicled in the information museum located at the visitor center. The gorge is a treasure trove of archaeological sites and information, filled with fossils, settlement remains and stone artifacts. Lecture tours are offered.