The second best hotdog I've ever had was a few years ago in NYC. Something about a hotdog from a New York street vendor's cart...classic!

The best hotdog I've ever had was at Cleveland's Municipal Stadium. An Indians game isn't the same without a hotdog or two. Honestly, the dog itself isn't that special...it's the MUSTARD!! This is far and away the BEST hotdog mustard on the planet (if you're from Cleveland). Check it out here: http://www.stadiummustard.com

FWIW, there's a pretty decent hotdog to be had at the Navy Pier in Chicago, too...