The cathedral, located at the central square (Plaza 9 de Julio), is one of the most important and remarkable buildings of the city. The current church is the result of a couple of other constructions. The first one was a very simple building with adobe walls and a few windows. Due to its construction the church started to break quickly. A second church - now with two towers and a dome - was built on the same place and survived even an earthquake in 1692.

The current church started to be built in 1858 and it took twenty-five years before it was finished. The architectural style of the cathedral is neo-colonial. It has a rectangle floor - with beautiful tiles - and three naves, a presbytery and a semicircular apse in the high altar. The transept is very high, with a dome ceiling. The side aisles have stained glass windows.

The (pink coloured) cathedral is dedicated to Jesus and the Virgin Mary. In the year of 1941 it was declared a national monument.