Improve site navigation
Overall, your site is excellent. However, navigation on your site is very poor. When confronted with one of your large collections, the user has no choice but to flip page by page to the end. In the case of "Art Nouveau", that means flipping through 6000+ images. With "Vincent van Gogh" that means flipping through 1900+ images. How about allowing a user to go directly to the end of a collection? How about allowing a user to go directly to the 25%, 50%, 75%, and 100% points in a collection. Such mechanisms would allow the user to peruse distant parts of a very large collection without ALWAYS starting at the beginning. What makes the situation even worse is that the user must scroll through a whole page to get to where he can flip to the next page. How about putting a button at the top AND the bottom of each page so that the user can pass by a page without needing to scroll though it ?