The interior has the longest nave of any cathedral in Spain. The central nave rises to a height of 42 meters and is lavishly decorated with a large quantity of gilding. In the main body of the cathedral, the most noticeable features are the great boxlike choir loft, which fills the central portion of the nave, and the vast Gothic retablo of carved scenes from the life of Christ. This altarpiece was the lifetime work of a single craftsman, Pierre Dancart.
The builders used some columns and other elements from the ancient mosque, including its minaret, which was converted into a bell tower known as La Giralda, now the city's most well-known symbol.