I have always been curious about Mexico City, one of the largest cities on this planet and one with the most polluted air due to its topological character: surrounded by mountains and itself 2200 meters above sea level (leading to 20% less oxygene in the air).
I have not seen much of the city yet due to work and organising the trip. The metro is really cheap: 2 pesos for one passage! 19 pesos are around 1 euro. I guess this is affordable to most people here.
the city has uncountable historical buildings, such as the museum of art above.
this is the central post office. the metal at the counters and more of it all around the building has been imported from italy. the building is from mid 18th century.
wandering around the post office, you really get to think: wow, how important communications means must have been (and still are, remember the internet?) for the ruling class that they have built such a temple for it!
lunch. 2 euros for soup, rice, and a main dish. and it was good!