More like The Lost City

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The Lotus CavesNovel
John Christopherstandalone novel1969
Mysterious in tone, about aliens, set in near future and underground & caves.
“Two boys living in a moon colony find an unrestricted buggy, allowing them to travel beyond their usual boundary.”
from the catalogue
Dinosaur SummerNovel
Greg Bearstandalone novel1998
About survival, set in latin america and lost world.
“Less than fifty years after Professor Challenger's famed journey to the Lost World, America's last dinosaur circus is closing down... but the adventure of a lifetime is about to begin.”
from the catalogue
The Stonehenge GateNovel
Jack Williamsonstandalone novel2005
Mysterious in tone, 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
Have Space Suit - Will TravelNovel
Robert A. Heinleinstandalone novel1958
Space opera, about aliens and survival, set in near future.
“One minute Kip Russell was walking about in his own backyard, testing out an old space suit and dreaming about going to the moon - and the next he was out cold and the captive of an insidious space pirate.”
from the catalogue
Rocket Ship GalileoNovel
Robert A. Heinleinstandalone novel1947
Hopeful in tone, about coming of age, set in near future.
“Three teenage boys do backyard experiments on powerful model rockets.”
from the catalogue
Attack from AtlantisNovel
Lester del Reystandalone novel1953
About aliens, set in underwater.