More like Land Beyond the Map

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The Lotus CavesNovel
John Christopherstandalone novel1969
About aliens and space exploration, set in the moon and near future.
“Two boys living in a moon colony find an unrestricted buggy, allowing them to travel beyond their usual boundary.”
from the catalogue
Non-StopNovel
Brian W. Aldissstandalone novel1958
About survival, set in spaceship and generation ship.
The Stonehenge GateNovel
Jack Williamsonstandalone novel2005
Adventure, about space exploration, set in contemporary and africa.
“Stumbling on ancient stones in the Sahara Desert, four adventurous excavators and poker buddies realize that they have discovered a gateway to other worlds, from technologically advanced planets to primitive civilizations.”
from the catalogue
EtidorhpaNovel
John Uri Lloydstandalone novel1895
Set in underground & caves and 19th century.
TimelineNovel
Michael Crichtonstandalone novel1999
Time travel, about survival, set in europe and medieval.
The DigNovel
Alan Dean Fosterstandalone novel1996
Adventure, about space exploration, set in other star systems and near future.
“When Low, prize-winning journalist Maggie Robbins, and scientific genius Ludger Brink investigate the asteroid's surface, they are hurtled into a time and place of revelation, mystery, and danger: the planet Cocytus.”
from the catalogue