Superman #187

This 80-Page Giant from DC's 1966 lineup is a treasure trove spotlighting Superman's legendary Fortress of Solitude, promising readers an all-star collection of stories under the banner "Superman's Inner Sanctum." The cover by Curt Swan and George Klein shows the Man of Steel hoisting an enormous golden key — the kind that unlocks his Arctic retreat — while surrounding panels tease glimpses of a bottle city, strange interplanetary zoo creatures, an undersea fortress, and even the Fortress as it appeared in 1942. At 25 cents for a full 80 pages, this is a wonderfully dense package for any fan eager to explore every hidden corner of Superman's most private domain.