Explore a story of natural history discovery in an interactive experience, Making Natural History, voiced by Museum … Even though dinosaurs lived millions of years ago, we know about them thanks to fossils. Natural History Museum: Dinosaurs!!! What were the largest dinosaurs in Britain 200-145 million years ago? Get your fill of dinosaur facts and fun, and find out all about the reptiles that once dominated our planet. - See 36,871 traveler reviews, 22,513 candid photos, and great deals for London, UK, at Tripadvisor.