Parish Church of Our Lady of O
This parish church was erected in the years of great Spanish empire, when Spain was ruled by Emperor Carlos I. It was at that time that the Lord of the town, the First Duke of Arcos, don Rodrigo Ponce de Lyon paid for the building, finishing the interior in 1537, years after his death.
In the church's interior the combination of various styles such as Gothic, Isabelline, Plateresque and Baroque are to be noted.
The church is formed with a central, unique structure in a gothic style with plateresque and renaissance tendencies together with five additional chapels.
The central structure is formed with three beautiful domes, separated by robust, smooth ribs.
The magnificent dome of the great chapel is formed with intricate ribs adorned with leaves and circular rosettes where the coat of arms of the Ponce of Lyon are carved together with religious motifs.