Depending on the time period, condition, and rarity, comics can be worth multiple millions — or no more than the paper they’re printed on. Here’s how to tell.

A copy of Captain America Comics No. 1 that spent nearly 80 years stored in a cardboard box has sold for $716,750 at auction.

Collecting comic books was just a hobby for teenagers decades back, but as time went by, Marvel and DC comics, action figures and other merchandise related to superheroes started gaining big ...