On a quest to find out what happened to his missing brother, a scientist, his nephew and their mountain guide discover a fantastic and dangerous lost world in the center…

When brothers Richard and Bryan and young nanny Crystina fall into a hole while exploring one of Hawaii’s many volcanic caves, they plummet all the way to the center of…

An Edinburgh professor and assorted colleagues follow an explorer’s trail down an extinct Icelandic volcano to the earth’s center.