Ngorongoro is one of the largest unbroken calderas in the world that isn’t a lake. Its steep walls soar 400m to 610m and provide the setting for an incredible natural drama, as prey and predators graze and stalk their way around the open grasslands, swamps and acacia woodland on the crater floor. It's such an impressive sight that, other vehicles aside, you'll wonder whether you've descended into a wildlife paradise.