This "80 pg. Giant G23" contains a collection of reprints dealing with Superman's Fortress of Solitude.

1. Cover by Curt Swan and George Klein.
2. "Superman's Fortresses of Solitude!" Reprinted from Action Comics #261.
3. "Cap's Hobby Hints" by Henry Boltinoff.
4. "The Boy in the Bottle!" Reprinted from Superman's Pal Jimmy Olsen #53.
5. "Tales of the Imitation Fortresses" full text article by E. Nelson Bridwell.
6. "Superman's Hall of Trophies!" Reprinted from Action Comics #164.
7. A Look at Superman's First Fortress from the 1942 Story "Muscles for Sale!" Excerpts 2 pages from Superman #17.
8. "Three Nights in the Fortress of Solitude!" Reprinted from Superman's Girl Friend, Lois Lane #14.
9. "The Super-Merman of the Sea" Reprinted from Action Comics #244.
10. "The Land of a Million Supermen" Reprinted from Action Comics #233.