Jay Y.
Yelp
In the midst of the crowded Madero street, it's easy to miss the entrance of San Francisco unless you were looking for it - but you should look for it because this church is one of the most important churches in Mexico!
Iglesia de San Francisco (Church of St. Francis) was first established by the twelve Franciscans who were sent by Spain as Mexico's first missionary, making this church one of Mexico's earliest churches. In its heyday, San Francisco used to be the largest monastery compound that spanned for many blocks!
Unfortunately much of San Francisco was demolished. Today, not only the front facade was completely covered by nearby buildings, the church today is what was a side chapel in the once-enormous church complex. Nonetheless, you can still witness a glimpse of the church's past glory from the simple grandeur of its scale and the elaborate decoration of the golden altar!
While the church has significantly downsized physically, its historic significance remains. As you explore Centro Historico, make sure you mark this on your map for this important milestone of the Mexican faith!
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tl;dr version:
1) One of Mexico's earliest churches and used to be the grandest
2) Though significantly downsized, still a beautiful impression
3) Recommend as a stop in a Centro Historico trip