The Museo Del Prado*, in Madrid, has launched an app called Second Canvas, which allows you to look at some of their artworks in great detail. If you're an art fiend, I reckon you'll like it. I've tried it out in my iPad Mini, but it really needs a retina iPad to shine.
* If you've never heard if the Prado, it's Madrid's answer to the Louvre, and IMHO in some ways better (and the impressive Sofia is a short walk away, if you like modern art).
* If you've never heard if the Prado, it's Madrid's answer to the Louvre, and IMHO in some ways better (and the impressive Sofia is a short walk away, if you like modern art).