I can't stop looking a these photos from David Stephenson's book Heavenly Vaults: From Romanesque to Gothic in European Architecture (Princeton Architectural Press, 2009). Structure is beautiful, people!
Choir, King's College Chapel, Cambridge, England, begun 1448, vault 1508-15
Nave, Frauenkirche, Munich, Germany, 1468-94
"Stephenson presents more than eighty Romanesque and Gothic vaults in kaleidoscopic photographs that reveal their complex geometrical structures, decorative detailing, and ornamental painting in ways they have never before been seen." (more)