in the Sahara desert, from whom he learns about the machine’s objective. Popularizing the concept of the "Hollow Earth" in fiction, Burroughs depicts a haunting subterranean world of endless oceans, vast jungles, and bizarre weather conditions. The author expresses the ludicrous and ridiculous beliefs of the seventeenth and eighteenth-century scientists that the earth was hollow, explaining some of its anomalies.

"At the Earth's Core" was made into a movie in 1976 starring Doug McClure and Caroline Munro. The vivid natural descriptions, terrific adventures, and fascinating characters make this novel a must for fans of Burroughs and the fantasy genre. Edgar Rice Burroughs (1875-1950) was an American author, best known for his novel ‘Tarzan of the Apes’ (1914) and its sequels, as well as the Barsoom series. During World War II, he was one of the oldest U.S war correspondents. Tarzan and his adventures are loved by both young and old, and are evergreen classics. Many have watched at least one Tarzan TV series or movie with the most popular probably being the Walt Disney animation film from 1999 and "The Legend of Tarzan" from 2016 starring Alexander Skarsgård and Samuel L. Jackson.