At 1,800 feet, this big fella was the world's tallest free-standing structure for 32 years until 2007 when it was surpassed by the Burj Khalifa. Take the insane elevator ride to the top for some of the best views in North America. SO worth the price of admission.
If you're an American coming into town for this wedding and you like cigars, then this is a must. Go get yourself a nice Cuban cigar and take a stroll through downtown or find a nice seat by the water. My personal favourites are the Cohiba, H. Upmann, or Romeo and Juliet.