A sprawling Latin American market, where you can buy antiques, handicrafts, fossils, clothes and crystals. Everything in fact at the cheapest prices in the city.
You can have a retrato painted (a picture of a life event that you want a to dedicate to a particular saint). Frida Kahlo collected them. You can see shrines to the Santa Muerte, a pre-Columbian god disguised as a catholic saint dressed as the grim reaper. Sundays are best.
Take a micro bus on Avenue Reforma in the historic centre or Zona Rosa and ask to be put off at the Tianuis (street market) del Tepito
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Take care in this area, it's notoriously dangerous. If you really have to enter Tepito, I'd advise it to be in a group of no less than about 200. My girlfriend at the time (a Mexican) has been robbed there several times, my flatmate was violently assaulted. I got mugged while on a bus passing through the area. I'd be very careful.
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