My fourth and final day in Mexico City was a real treat: the perfect blend of making a few new friends and finally clapping eyes on a building that feels like an old pal. I met up with graphic designer Alex Quinto at my hotel and we zipped (well, no one really zips in Mexico City traffic) to the house and studio of the great Mexican modernist Luis Barragan. We saw two of his designs, stopped downtown to walk around a bit more, and then met architect Lucio Muniain at his home for lunch. It was a great meal and I certainly had plenty to reflect on during my excriciatingly slow crawl to the airport for my evening flight. Have a look at the slideshow.