 The Chapel of the Immaculate Conception ( Spanish : Capilla de la <unk> <unk> ) was built between 1642 and 1648 . It has a churrigueresque altarpiece which , due to the lack of columns , most likely dates from the 18th century . The altar is framed with <unk> — instead of columns — and a painting of the Immaculate Conception <unk> over it . The altar is surrounded by paintings by José de Ibarra relating to the Passion of Christ and various saints . The chapel also contains a canvas of Saint Christopher painted by Simon Pereyns in <unk> , and the <unk> by Baltasar de Echave <unk> , painted in 1618 . The altarpiece on the right side is also dedicated to the Immaculate Conception and was donated by the College of Saints Peter and Paul . This chapel holds the remains of Franciscan friar Antonio <unk> de <unk> who was <unk> in what is now the north of Mexico . 
