It is the uplifted metamorphic gneiss inselberg, a monolith that is fully exposed above the plain in the shadow of crater Mountain-Oldonyo Lengai. --The Nasera might be the only known biggest fully exposed complete inselberg in the region. -The site has been internationally known for decades through its archaeological resources that have been excavated since 1930s. -It is 27 km north of Olduvai -What to do there? Admire the structure and even climb to its top for a magnificent view of the plains nearby, with the possibility of having one or two animals in the vicinity. Or try to spot the rock paintings in the area. -Best time to visit Any time of the year or better yet or during the wildebeest migration.