The Project Gutenberg eBook of Architecture: Gothic and Renaissance, by T. Roger Smith.
Six different types of vaults
SPA 2713 : Alcazar, Seville in Spain
Image SPA 2713 featuring decorated area from the Alcazar, in Seville, Spain, showing Geometric Pattern using ceramic tiles, mosaic or pottery.
The Art Newspaper
The Art Newspaper is the journal of record for the visual arts world, covering international news and events. Based in London and New York, the English-language publication is part of a network of titles founded by Umberto Allemandi with editions in Italian, French, Russian, Chinese and Greek.