Comic Title: Action Comics #261
Publisher: DC (National Comics Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: February 1960
On Sale Date: December 31, 1959 Newsstand Date December 31, 1959
Source: House Ad, Superman's Girl Friend Lois Lane #15, Page 21

Copyright Date December 31, 1959
Source: Library of Congress, Periodicals 1960

Frequency: Monthly
Cover Price: $0.10
Page Count: 32
Editor: Mort Weisinger

Title: "Superman's Fortresses of Solitude"
Pages: 12

Feature(s):
Superman (of Earth-1)

Writer: Jerry Siegel
Penciller: Wayne Boring
Inker: Stan Kaye

Reprinted In:
Superman #187 (1966)
Showcase Presents Superman Vol. 2 TPB (2006)
Superman:The Secrets of the Fortress of Solitude TPB (2012)
Superman:The Man of Tomorrow Archives Vol. 3 HC (2014)

Feature Character(s)

• Superman (last appearance in Brave and the Bold #28; next appearance in Superman's Pal, Jimmy Olsen #43)

Villain(s)

• "Big Bob" Kruger (no further appearances)
• Anti-Superman Gang (last appearance in Superman's Pal, Jimmy Olsen #39; next appearance in Superman's Girl Friend Lois Lane #21)
• Urko the Terrible (a living space cloud; no further appearances)
• Various Fire-people (no further appearances)

Other Character(s)

• Mars-Ol and Ra-Ho (Kandorians; no further appearances)

Synopsis:
Superman brings his Fortress of Solitude to Metropolis for tours. His robots keep guard against possible saboteurs sneaking in. During the tour Superman relates the stories of when he located his Fortress in space and in the center of the Earth.

Two members of the Anti-Superman Gang plant an explosive bomb inside the Fortress that they smuggled in past the guards. Superman is warned by the citizens in Kandor of the bomb and is able to dispose of it before it can destroy the Fortress. Superman then rounds up the gang.