Palacio de Belles Artes
The wedding cake of a building. I've entered the lobby before but this trip we went one further and got tickets to the Ballet Folklorico which was fabulous. The inside of the Palacio Belles Artes is Art Deco whereas the outside is more Art Neuveau. The reason for this is the construction was interrupted by the Mexican Revolution and the interior wasn't finished until later.
Picking up my tickets from Ticketmaster was a nightmare. We had to go to the Ghandi Music store on Modero near the Zocolo (not the one across the street from the Palacio Belles Artes) and they wouldn't take my credit card because they wanted to use an old slide credit card reader that made an impression on a piece of paper. My credit card does not have embossed numbers so the machine wouldn't work. It took a very friendly couple and about 90 minutes to sort it all out. We had to cancel the tickets and then buy them again with the exact same credit card.