The site on which the mall was built played host to the Twin Cities' major sports venue, Metropolitan Stadium, between 1956 and 1981. The structure was replaced by the Hubert H. Humphrey MetroDome.
Photo from Wikipedia / "Wahkeenah"
A commemorative plaque marks the location of home plate, in the "Old Met" stadium. This is found in the northwest corner of today's Nickelodeon Universe indoor theme park.
Photo from Wikipedia / "Yassie"