The building has a structure in three tall vaults and ambulatory, with fine tracery windows set, and numerous stained glass. The interior is characterized by unity of style (late Gothic), except for the dome, built around 1630 by Pedro de Brizuela. Gothic vaults rise to 33 meters high and measures 50 meters wide and 105 long. The bell tower reaches almost 90 meters. The current stone spire crowning the tower, dating from 1614, was erected after a major fire caused by a thunderstorm. The original spire, entirely Gothic, was built of American mahogany had pyramidal structure, and was the tallest tower in Spain.
Among the most prominent chapels are that of the Santísimo Sacramento, with a Reredo by José de Churriguera, and the Chapel of San Andrés, with a Tryptich of the Deposition by Ambrosius Benson; and the chapel of the Deposition with the recumbent Christ by Gregorio Fernández.
The retablo mayor, or main reredos, of the cathedral was carved by Francisco Sabatini, and is dedicated to the Virgin of the Peace. It is adorned with the Segovian Saints Frutos, Geroteo, Valentín and Engracia. The choir has gothic seating.
- Capilla de San Andrés Apóstol
- Capilla de San Cosme y San Damián
- Capilla de San Gregorio
- Capilla de la Concepción
- Capilla del Cristo Yacente (Reclining Christ)
- Capilla de Santa Bárbara
- Capilla de Santiago Apóstol
- Capilla del Cristo del Consuelo
- Crescentius of Rome
- Saint Fructus (d. 715), and his siblings Saint Valentine (Valentín) and Saint Engratia (Engracia).
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