Most of these databases or websites offer provenance, descriptive information and bibliographies to accompany each image. The ease of downloading images and text varies.
Produced by the Aga Khan Trust for Culture and the Aga Khan Documentation Center, MIT Libraries, Archnet is an open access resource on the architecture, urbanism, landscape design, and visual culture of the Muslim world.
Islamic Heritage Project is a digital collection of Islamic manuscripts, published texts, and maps from Harvard's libraries and museums. Materials date from the 10th to the 20th centuries and represent many regions, languages, and subjects.
Netherlands Institute in Turkey: Machiel Kiel Photographic Archive. Created between 1960s - 1990s by Machiel Kiel, historian and a former director of NIT, the archive documents many monuments which have not survived, or have been significantly altered during the late 20th century. As of May 2012, 1,300 photographs have been classified and digitized for Ottoman-Islamic monuments outside of Turkey in southeast Europe. Phase 2 will comprise Christian art produced under Ottoman rule; phase 3 will include monuments in Turkish Trace. Search by country and site.