Originally Posted by Chula Vista

Rama is pretty one of a kind but all of these are absolute essential Sci-Fi reading with lots of the same wonderment at the premise.

Ringworld
The Foundation Trilogy
The Legacy of Heorot (only book I've read 3X)
Enders Game
Hyperion + The Fall of Hyperion
American Gods
Do Androids Dream of Electric Sleep
2001 A Space Odyssey (same basic story but so much more detailed than the movie)
The Martian Chronicles
The Forever War
I Am Legend (the movie SUCKED!!!)