Hunting Trilobites at the Earth's Core

Sketch by the great Mark Schultz, creator of Cadillacs and Dinosaurs.

The Heart of the Hollow World - scrollon

A web comic named The Heart of the Hollow World is on a website and app called Scrollon.

In 1898 Emery Trent had no plans of discovering a lost world when he set out to be the first man to reach the North Pole. But events took an unexpected turn... The Heart of the Hollow World is an ongoing webcomic using Scrollon technology by creator Doug Lefler.

Check it out here.

Tarzan issue 180 (1968)

Turtles at the Earth's Core