Diamond Dogs, Turquoise Days
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Set around the late 25th century, Diamond Dogs is a new treatment of the
classic SF plot of the deadly maze. While visiting the Monument to the
Eighty in Chasm City, Richard meets his old friend Roland Childe, who has
been presumed dead for over a century and a half. Childe takes Richard back
to his home, and reveals that he is assembling a team to tackle a curious
artificial - alien - structure found by probes sent out secretly by his
family ages ago.
https://en.wikipedia.org/wiki/Diamond_Dogs,_Turquoise_Days
Published in 2003