Catedral de Burgos
3 architectural styles in one Cathedral
The Cathedral's construction began in 1221, in the style of French Gothic architecture and the Latin cross.
After a hiatus of 200 years, it went through embellishments of great π- & φ-based splendor in the 15th & 16th centuries:
The octagonal Chapel of the Constable, the octagonal tower and the two spires are elements of the flamboyant Gothic which gives the cathedral its unique profile:
4 cupolas + 1 semi-circle ambulatory
4 Pentagrams =
Icosagonal stained glass window:
15th century green colored section has:
2 squares+1 GMR & 1 square+2 GMR's:
so have the 2 stairways:
Golden Mean proportions:
Spire angles