March, 2019. A short duration contract offered an opportunity to visit Mexico City for a week; although I had been to Mexico before this was the first chance to explore the city. With only what amounted to a day and a half of free time it was always going to prove challenging to cram as much in as I could. In the end I decided on one of these open-top bus tours; it's a great way to get a quick orientation to the city and the sites.