Sardine Run

Mind-blowing experiences are the focus of this South African company's incredible trips to the wilds of Southern Africa—everything from shark diving to cycle safaris with elephants and lions. The Two Oceans Extreme Trip includes great white shark encounters in Gansbaai, tiger shark diving on the Aliwal Shoal, and the sand tigers and bull sharks of the Protea Banks. For the brave of heart, the Sardine Run expedition offers what National Geographic's chief underwater photographer, David Doubilet, has called "the most exciting dive in the world." Trips to experience this natural phenomenon attempt to intercept the intense feeding frenzy by thousands of predators on massive shoals of migrating sardines.