Batman: Gotham Knights #18

Here's a striking 2001 entry in the Gotham Knights run — the cover by Brian Bolland presents an unexpectedly surreal tableau: Aquaman, wild-haired and clad in his armored look with green scale leggings, crouches amid rocky underwater terrain before an enormous Lincoln penny, bubbles drifting up around him. The sheer scale of that coin against the cavern setting gives the image a dreamlike, almost mythic quality that makes you wonder exactly what kind of crossover Devin Grayson has cooked up. With interior art by Roger Robinson and John Floyd, "Cavernous" looks like one of those quietly offbeat issues that keeps a long run feeling fresh and surprising.