In what is considered one of the earth's greatest spectacles, over a million wildebeest make their way from Tanzania’s Serengeti to Kenya in search of lusher grasslands. The great migration is a very good reason to visit the diamond in Kenya’s crown of national parks, the Masai Mara. The most dramatic scenes take place at the river crossings, where the wildebeest slip and crash down the steep embankments of the Mara River into crocodile- and hippo-infested waters and, if they get through that, still have to gallop past the Mara’s high density of lions awaiting them on the other side. The best time to see the migration here is between the months of July and September. Porini Lion Camp is an excellent accommodation choice, with knowledgeable guides and a responsible approach to protecting the delicate Mara ecosystem.