Action Comics #1 features the first appearance of Superman, a creation of
Jerry Siegel and Joe Shuster. The publication is considered to be both the
genesis of the super-hero genre as well as the most valuable comic book 
of all time, with a single original copy selling for more than $2 million in
2011.

From left: Superman creators Jerry Siegel and Joe Shuster
who were originally paid only $130 by DC Comics in 1938.