20. Madison Square Garden
Location: New York
Current teams: St. John's Red Storm men's basketball, New York Golden Blades, New York Knicks, New York Rangers
As the self-proclaimed "World's Most Famous Arena," the fourth and current incarnation of Manhattan's sports hub is about as big time as you can get in the sports venue universe especially with the Knicks having made it to the playoffs last season. Make it here while you can; MSG has been given 10 years to vacate its premises, and while it will find a new home, the history won't come with it.