This looks amazing. I have long wanted to crawl some of the big museum collections, and you've done tons of them. How much space do all the images take up altogether? How many images in total?

Some feedback: The "About Us" etc. links at the bottom are hard to click on the main page, as the infinite scroll moves them as soon as you get there. I also managed to get Chrome to peg a CPU core at 100% and essentially block the tab by scrolling down for a few minutes. A pagination system would make longer (> a couple of minutes) painting browsing sessions much more stable/possible.