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Photo: Mx._Granger, CC0 via Wikimedia Commons
If you instead follow Cap. Uyunis, the street on the other side of the church, you'll get to a hiking trail that leads up a hill with some large crosses on it, a nice spot for viewing the town and the surrounding area.
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San Francisco de Paula Church was built in the 17th century and declared National Historical Monument in July 1941. The church is small and has famous pictures called "Los ángeles arcabuceros", which were brought from Cusco in the colonial period. These pictures were made by a mixed-race artist, but he didn't know what angels looked like, so a priest told him that "the angels" were like them, therefore the man painted angels like soldiers with arquebuses and wings. The altar of the church is handmade and gilded. The front door has a curious lock dating back to 1745. Its key is placed in an inverted form to the current system. It also has a silver key which weighs 700 grams.