The Lost World is a novel released in 1912 by Sir Arthur Conan Doyle concerning an expedition to a plateau in the Amazon basin of South America where prehistoric animals (dinosaurs and other extinct creatures) still survive.

The Lost World is a 1925 American silent fantasy monster adventure film adapted from Sir Arthur Conan Doyle’s 1912 novel. In 1998, The Lost World was deemed “culturally, historically or aesthetically significant” by the Library of Congress and selected for preservation in the United States National Film Registry.

The Lost World is a film of many firsts: first film to be shown to airline passengers, in April 1925 on a London-Paris flight by the company Imperial Airways; first feature length film made in the United States, possibly the World, to feature model animation as the primary special effect, or stop motion animation in general; first dinosaur-oriented film hit, and it led to other dinosaur movies, from King Kong to the Jurassic Park trilogy.