Édouard Riou

First appearance: A Journey to the Centre of the Earth (French: Voyage au centre de la Terre)
Author/Creator: Jules Verne
Media: Novel
Year: 1864
Located: Earth's center
Plot/Premise: A German professor (Otto Lidenbrock in the original French, Professor Von Hardwigg in the most common English translation) believes there are volcanic tubes going toward the center of the Earth. He, his nephew Axel, and their guide Hans encounter many adventures, including prehistoric animals and natural hazards, eventually coming to the surface again in southern Italy. The living organisms they meet reflect geological time; just as the rock layers become older and older the deeper they travel, the animals become more and more ancient the closer the characters approach the center. They encounter no dinosaurs but while crossing the Lidenbrock Sea, they witness a battle between an Ichthyosaurus and a Plesiosaurus.

Adaptations: Films - 1959, 1976, 1978, 1989, 2008, 2008; TV series/ Miniseries/TV film, 1959, 1993, 1999, 2008; Radio play: 2000; Stage play: 2000; Video game: 2008; Music album: 1974; Park attraction: 2008

First appearance: A Strange Manuscript Found in a Copper Cylinder
Author/Creator: James De Mille
Media: Novel
Year: 1888
Located: Earth's interior beneath Antarctica
Plot/Premise: Four sailors discover a copper cylinder containing a manuscript written by the adventurer Adam More, who was shipwrecked in the southern hemisphere. They read its contents out to one another, and the incredible story unfolds of his journey through a subterranean tunnel to a lost world of prehistoric animals, plants and people, all sustained by a natural volcanic heat despite the long Antarctic night. This strange utopian society, a lost world in which humans coexist with monstrous prehistoric animals (including plesiosaurs), is the antithesis of Victorian England, as poverty is preferred to wealth and darkness to light.

First appearance: Professor Antediluvius (Profesor Przedpotopowicz)
Author/Creator: Erazm Majewski
Media: Novel
Year: 1898
Located: Earth's interior beneath Bosnia
Plot/Premise: Entering a crevice in the earth in Bosnia three explorers climb down through a series of caverns containing the earth's geological ages.

First appearance: At the Earth's Core
Author/Creator: Edgar Rice Burroughs
Media: Novel
Year: 1914
Located: Earth's interior
Plot/Premise: Pellucidar is a fictional Hollow Earth milieu invented by Tarzan creator Edgar Rice Burroughs for a series of action adventure stories. In a notable crossover event between Burroughs' series, there is a Tarzan story in which the Ape Man finds his way into Pellucidar. Pellucidar is populated by primitive people and prehistoric creatures, notably dinosaurs.
Sequels/Other appearances: Pellucidar (1915); Tanar of Pellucidar (1929); Tarzan at the Earth's Core (1929); Back to the Stone Age (1937); Return to Pellucidar (1941); Land of Terror (1944); Savage Pellucidar (1963); John Eric Holmes: Mahars of Pellucidar (1976), Red Axe of Pellucidar (1993)
Adaptations: At the Earth's Core (Film, 1976)

First appearance: Plutonia (Utazás Plutóniába)
Author/Creator: Vladimir A. Obruchev
Media: Novel
Year: 1924
Located: Earth's interior
Plot/Premise: A Russian Artic expedition inadvertently enters the interior of the earth. Building a raft they travel on a "river of time" from which they observe, the further south they go (on the earth's inner surface) the older, geologically, the life becomes. They encounter a wide variety of dinosaurs and eventually escape only to find a surface world engulfed in world war.

Plot/Premise: Skartaris is essentially a translation of Edgar Rice Burroughs' Pellucidar into the graphic medium, with elements of Jules Verne and half a dozen other fictional Hollow Earth settings, and the admixture of magic and the Atlantis myth. In Grell's concept, as in Burroughs', the Earth is a hollow shell with Skartaris as the internal surface of that shell. Skartaris is accessible to the surface world via a polar opening allowing passage between the inner and outer worlds. There are also various tunnels connecting the interior world with the surface. Skartaris is lit by a miniature sun suspended at the center of the hollow sphere, so it is perpetually overhead wherever one is in Skartaris. Skartaris is overrun by a variety of prehistoric creatures from all geological eras, notably dinosaurs. Skartaris is named after the volcano through which Jules Verne's adventurers made their Journey to the Center of the Earth. Skartaris was retconned into being Another Dimension. It cannot actually exist within the DC Universe's Earth, which isn't hollow.
Sequels/Other appearances: Suicide Squad: Raise the Flag (2007); "The Land of Summer's Twilight" (The Books of Magic issue #3)
Adaptations: "Battle at the Earth's Core" (Super Friends, TV animation, 1973); "Chaos at the Earth's Core" (Justice League Unlimited, TV animation, 2004)

First appearance: The Last Dinosaur
Author/Creator: William Overgard, Alexander Grasshoff, Shusei Kotani
Media: Film
Year: 1977
Located: Inside a dormant volcano near the North Pole
Plot/Premise: Masten Thrust, a billionaire oil tycoon and big-game hunter, has announced the discovery of a lost world hidden inside the warm pocket of a dormant volcano at the North Pole. Traveling via his "Polar Borer", Thrust and his team find that the hidden world is populated with both dinosaurs and prehistoric humans.

First appearance: Journey to the Underground World
Author/Creator: Lin Carter
Media: Novel
Year: 1979
Located: Earth's interior
Plot/Premise: Under the trackless sands of the Sahara lay Zanthodon. That vast subterranean realm is the final homeland of the one-time masters of the world's surface — great dinosaurs, mighty jungles and living bands of primitive peoples from Neanderthals to Ancient Minoans and even Barbary pirates. Zanthodon is heavily modelled on Edgar Rice Burrough's creation, Pellucidar.
Sequels/Other appearances: Zanthodon (1980), Hurok of the Stone Age (1981), Darya of the Bronze Age (1981), Eric of Zanthodon (1982)

First appearance: Ice Age: The Dawn of the Dinosaurs
Authors/Creators: Carlos Saldanha, Mike Thurmeier, Peter Ackerman, Michael Berg, Yoni Brenner, Jason Carter Eaton and Mike Reiss
Media: Film
Year: 2009
Located: Enormous subterranean cavern beneath the tundra
Plot/Premise: Scrat the saber-toothed squirrel, Manny the mammoth, Sid the sloth and the gang are back for a third prehistoric Ice Age movie in which they discover a subterranean dino-infested world beneath the tundra with locales like the Jungle of Misery, the Plates of Woe, and the Chasm of Death. They they encounter Rudy the Baryonyx, Roger the Pteranodon, a Brachiosaurus, Ankylosaurus, Quetzacoatlus, Guanlong, Kentrosaurus and Chasmosaurus.

Sequels/Other appearances: Ice Age (Film, 2002); Gone Nutty (Short film, 2003); Ice Age: The Meltdown (Film, 2006); No Time For Nuts (Short film, 2007), Surviving Sid (Short film, 2008)
Adaptations: Ice Age: Dawn of the Dinosaurs (Video game, 2009)