An imposing golden structure provides a connection between the past and future in this enigmatic story of space and time.  When Dr. Maisam Dhala and other gravitonautas are sent on a mysterious mission, their ship's computer system starts to display increasingly bizarre behavior, leading up to a tense showdown between man and machine that results in a mind-bending trek through space and time.

multi-xover.  Land of the Lost/2001/ novels of L. Sprague de Camp.