More like The Magic Labyrinth

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RiverworldSeries
series37 books1965
Science fiction, about faith and religion, set in far future and other star systems.
“The Riverworld is an artificial, or heavily terraformed, planet where all humans who ever lived throughout history have been resurrected.”
from the catalogue
Start with River of Eternity →
The Colors of SpaceNovel
Marion Zimmer Bradleystandalone novel1963
Space opera, about aliens and space exploration, set in space.
“The Lhari seem peaceful and friendly, but they go to some lengths to protect their monopoly on faster-than-light travel.”
from the catalogue
Known SpaceUniverse
universe142 books1964
About aliens, set in space.
“Give a clever species a few centuries and a working fusion drive, and it will fill the sky with problems.”
from the catalogue
Start with Ringworld →
includes Ringworld, Fleet of Worlds, Man-Kzin Wars
DuneUniverse
universe78 books1963
Space opera, about political intrigue.
“The desert planet, where empire runs on a single substance: the spice melange, which folds space, prolongs life, and unlocks prescience, and which exists nowhere else in the known universe.”
from the catalogue
Start with Dune →
includes Dune, Heroes of Dune, Dune Prequels, Dune Sequels, Background of the Dune Universe
The AvatarNovel
Poul Andersonstandalone novel1978
Space opera, about aliens and space exploration.
“With the aid of the political opposition, they escape and journey through the portal in search of knowledge, and perhaps even to meet those who created the portal system.”
from the catalogue
Citizen of the GalaxyNovel
Robert A. Heinleinstandalone novel1957
Space opera, about coming of age and identity.
“On a planet far distant from Earth, a lame beggar buys a young boy slave who has forgotten his origins.”
from the catalogue