The Albertina Museum in Vienna is home to one of the largest and most important print rooms in the world. With approximately 65,000 drawings and approximately 1 million Old Master prints, it is considered to have one of the best collections of medieval drawings and prints in the world, next to that of the Vatican Library. Recently, the museum released most of its digitized image collection to the public domain, allowing people to use the images -- medieval drawings and Baroque engravings in particular -- freely.
As Medievalists.net states, “nearly 4,000 of these images date between the 12th and 15th centuries, with another 23,000 dating to the 16th century.”
The Albertina has a large collection of works by Albrecht Dürer, and more than 2,000 of his prints and engravings have also been made available.