What the T-Rex is to dinosaurs, the Great White is to sharks—the top-of-the-food-chain granddaddy of them all. These toothsome carnivores grow up to 5,000 pounds and 20 feet long; they are the largest predatory fish on Earth. That’s why it’s safest to view them from within the confines of a cage. If the company’s track record continues, you can expect to see seven Great Whites on a five-day cage-diving trip with Great White Adventures. Excursions are offered from August through October in the warm, crystal-clear blue waters (some of the best in the world for viewing Great Whites) off of Isla Guadalupe, near Mexico’s Baja California coast.