In the old city's main street, Siaghine St, you will see the first Christian church in Morocco. It is the only Moroccan church located inside a Medina : it is a Spanish church named La Purísima (''the purest'').
Around the end of the XIX century, during the Spanish occupation, this structure was also used as a residence for the Franciscan Missionaries. This building has undergone various transformations since that era.