Over the Kiwira River, Daraja la Mungu or the bridge of God, is a naturally built bridge. Near Arusha, visit the Shifting Sands of Serengeti, the parabolic black sand-dune formed by the flying ash from the Ol Doinyo Legai volcano. Amboni Caves at Tanga are also pretty exciting to explore as you get to be inside 30metre high caves. You should visit the longest caves in Tanzania,Matumbi Caves,made of limestone near Lindi. There are more landmarks in Arusha than you could ever imagine. You can see Laetoli footprints where you’ll experience human footprints in volcanic ash, which dates back to 3.6 million years. Visit the Olduvai Gorge in Arusha where you’ll find the origins of human evolution in the form of Homo Habilis, Homo Erectus and Homo Sapiens,all having lived here. With cave paintings, stone tools all around, you’ll be enthralled to see a place that is millions of years old and home to human beings inancient times.