Centre. Metro Bellas Artes
All post offices should have a cat or two. They could help lick the stamps. The glorious post office in the historic centre of Mexico City has one - it's black and quite spry. Or do I mean sprightly? Anyway, they have a resident post office cat, and if they have one here, why not in every post office? It would provide a very calming influence to customers who find themselves at the back of an enormous queue. And you could call it Parcel.
In the sumptuousness of Mexico City's Palacio Correos, as it's called, you can't help wondering why a post office was ever decked out with so much stained glass and marble in the first place. Most customers just want to collect their pension and go, don't they? Surely wrought-iron bannisters and belle-epoque architecture will just encourage dawdling? Anyway, head up to the second floor and enjoy the palatial surroundings. There you can also learn more about the obscure, and somewhat under-praised, Rowland Hill, who had one of those simple but revolutionary ideas which helped reform the UK postal system that was, apparently, pretty dire.