More like The Celaran Ruins

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Known SpaceUniverse
universe142 books1964
Science fiction, about aliens, set in far future and 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
HeecheeSeries
series19 books1972
completed
Science fiction and space opera, about aliens and space exploration, set in far future and space.
“The Heechee are an advanced alien race that visited the Solar System hundreds of millennia ago and then mysteriously disappeared.”
from the catalogue
Start with Gateway →
Academy / Priscilla (Hutch) HutchinsSeries
series16 books1983
Science fiction, about aliens and space exploration, set in far future and space.
“Beginning with The Engines of God, the series treats deep time and the near-total absence of intelligent alien life as its central mystery, favoring slow-burn discovery over action.”
from the catalogue
Start with The Engines of God →
The Colors of SpaceNovel
Marion Zimmer Bradleystandalone novel1963
Science fiction and space opera, mysterious in tone, about aliens and space exploration, set in far future and 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
Alex BenedictSeries
series13 books1987
Mystery & detective.
“Alex Benedict is an antiques dealer and part-time interstellar investigator, generations removed from Earth's first starfaring age, who keeps stumbling into forgotten history through the objects and ruins he trades in.”
from the catalogue
Start with A Talent for War →
RamaUniverse
universe7 books1973
Set in spaceship.
“Something is falling through the solar system on a hyperbolic orbit, and it is not a comet.”
from the catalogue
Start with Rendezvous with Rama →
includes Rama (2)