Some believe what separates men from animals is our ability to reason. Others say it's language or romantic love, or opposable thumbs. Living here in this lost world, I've come to believe it is more than our biology. What truly makes us human is our unending search, our abiding desire for immortality.Book #19 of 20 in the SDE Classics Science Fiction CollectionWhen infamous Professor Challenger claims he has seen dinosaurs in his latest South American trip, a group of adventurers, including Challenger, embark on a journey to verify these wild claims. After a local inhabitant guides them to Challenger's destination, the group scale a plateau only to find their only exit has been destroyed. Stranded on the plateau, Challenger and his party seek out the wonders this lost world has to offer!