First appearance: The Lost World
Author/Creator: Arthur Conan Doyle
Media: Novel
Year: 1912
Located: Inaccessible plateau in the Amazon basin
Plot/Premise: The Lost World chronicles an expedition led by Professor Challenger to a plateau in the Amazon basin of South America where dinosaurs and other extinct creatures still survive.

The pterodactyl swamp

Sequels/Other appearances: Frankenstein in the Lost World (Don Glut, 1971); Return to the Lost World (Nicholas Nye, 1991); Dinosaur Summer (of sorts) (Greg Bear, 1998)
Adaptations: The Lost World (Film, 1925); The Lost World (Film, 1960); The Lost World (Film, 1992); The Lost World (Film, 1998); Return to the Lost World (Film, 1992); "The Lost World" (TV miniseries, 2001), Sir Author Conan Doyle’s The Lost World – (TV movie and series, 1999-2002), Forgotten Futures III: George E. Challenger's Mysterious World, Torg

First appearance: Ghost of Slumber Mountain
Author/Creator: Willis O'Brien
Media: Film
Year: 1918
Located: Peak of Slumber Mountain at the edge of the Valley of Dreams
Plot/Premise: The spirit of the mountain hermit Mad Dick provides tale-spinner Uncle Jack with a time-viewing telescope. Through this Jack is able to see dinosaurs eating and fighting among themselves.

First appearance: The Mighty Gorga
Author/Creator: David L. Hewitt, Jean Hewitt
Media: Film
Year: 1969
Located: Remote African plateau
Plot/Premise: A circus manager leads an expedition to a remote African plateau inhabited by dinosaurs and a giant ape. The explorers are captured and slated to become human sacrifices when the towering title primate shows up and destroys everything. The explorers escape and find safety in an enormous cave that proves to be filled with priceless jewels.

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Teleport City: Mighty Gorga

YouTube: Mighty Gorga Trailer

B-Movie Central: Mighty Gorga

Eccentric Cinema: Mighty Gorga

Internet Movie Database: Mighty Gorga

Jabootu, the Bad Movie Dimension: Mighty Gorga (1968)