“Fratelli Alinari is the world’s oldest photographic firm founded in Florence, Italy in 1852. Its archives contain 3.5 million photographs, ranging from daguerreotypes to modern digital photos.” (Wikipedia).

Visit Alinari’s Photolibrary Education : “a digital catalogue of 150,000 photographs, both historical and contemporary, selected by the most qualified professors in Italian and European universities.”. You can also explore E-dotto “a complete teaching aid, created with the help of teachers and authors of educational manuals: 3 virtual laboratories (Art, History, Science), 150 topics with extensive texts, 15,000 images.” Registration needed in both case : 68 EUR.