Something I didn't know: if you add a '+' to the end of a bitly or tinyurl url, it will show what the actual url is and when it was created.
But twitter's t.co doesn't work that way.
Someone said Google's Translate will do something similar. So that might be an alternative.
wheregoes.com will also perform the checking. Ironically, from the tweet it goes through a t.co link, which does do the lookup.