Today we headed back downtown to the Centro Historico, using the third different metro line in three days, so I could see the various ways you can navigate the city. The only camera I've been toting these first few days in Mexico City, as I get used to traveling again, has been my iPhone camera, so those are the pictures I'll share again today. We first visited La Catedral, which is the oldest and largest Roman Catholic cathedral in all of the Americas. It was constructed over a period of two centuries, between the 1500's and the 1800's, and the Spaniards used the stones from a destroyed Aztec Temple to build it. There were lots of vendors selling jewelry and crafts surrounding the church, many wearing pre-hispanic dance costumes.