The Centre of Mexico

Time to explore the city and the obvious place to start is the Zocalo, the main square in the historic centre and according to Aztec beliefs, the centre of not just Mexico but the universe. 
It's big, though not as big I was expecting (a quarter of the size of Tiananm'en Square for example). On the north side is the Catedral Metropolitana, on the east the Palacio Nacional and in between, just out of view, the remains of the Aztec Great Temple. The Zocalo has been a gathering place for Mexicans since the 15th Century and now plays hosts to a massive great flagpole, demonstrations and the occasional rock concert. Paul McCartney performed to 250,000 here in 2012. We took it easy, dodging the 'Aztec' dancers, mariachis and organ-grinders.