More than just a post office, this is a palace, built at the beginning of the 20C by the Italian Adamo Boari, who also designed the Palacio de Bellas Artes. There is an incredible feeling of space in the building, which boasts a majestic staircase rising upwards. Here, lots of different styles come together to create a luxurious setting with marble tables and wrought-ironwork and blown-glass lamps made in Italy.