The Albertina was hosting a MAGNIFICENT drawing exhibition when we visited. Easily the best stand alone show I've ever seen of Old Master drawings. There were Michelangelos, Raphaels, Rubens, and even a Da Vinci. There were Durer drawings and Holbein drawings... you name the A-list artist, and the Albertina has a work on paper by them. The entire show was pulled from their own collection.
At a time when everyone else collected paintings and sculptures, and didn't give a second thought to drawings or sketches or preparatory works on paper, Prince Albert (the source of the museum's name: The Albertina) of Austria amassed the world's largest collection of drawings. Large in it's day and formidable even today, in the modern era of mega-museums with multi-billion dollar endowments, the masterpieces in the collection of the Albertina are amongst the most famous and priceless works in the Western cannon.
They've got the largest collection of Durer drawings and centuries worth of A list works by A list artists.