Iconic is an unusual word. Looking up the definition will get you a variety of meanings. If it means widely known and well-established, I don’t think MSG has the value it once did. The Knicks are horrid, beyond horrid for a big market team. The circus and boxing are outdated. I’m not sure if the avg. sports fan could even recognize the building from the outside, either. Augusta and Cameron, I agree with another, are not iconic in the entire sports world. Golf and college basketball are not universally recognized as big time sports. For the U.S., it’s football and baseball…. Football is king now, baseball then. Although, If the original Boston Garden were still around, that would be the answer, hands down. I think Lambeau has a a legit claim as being one of the top two or three iconic sports venues because it best represents the NFL and it’s upkeep/additions have been stellar.