The Rockies were established in 1991 as a part of a two team expansion in Major League Baseball. (Although they didn't play until 1993) The city had previously attempted to re-locate the Pittsburg Pirates before being granted their own franchise.
2007 Playoff Run
In 2007 the Rockies won 21 of their last 22 games and qualified for the World Series. Unfortunately for the Rockies, their luck ran out as they were swept by the the Boston Red Sox in the Series.