Instagram turns 4: The site's biggest celeb moments [Pictures]
b's 5th annual 10 People to Watch Under 30 in Baltimore [Pictures]
10 personality traits of the Millennial Generation [Pictures]
Sanctuary Bodyworks, a boutique gym in Fells Point [Pictures]
Baltimore album reviews [Pictures]
Superman's first apperance
June 10, 2013
Superman first appeared in Action Comics No. 1, published on April 18, 1938. It's widely considered to be the most valuable comic book of all time. As of 2011, a single copy sold for more than $2 million.