
1) National Gallery @ London, UK
My favorite children guide was from London's National Gallery. This is a page from their website which I like a lot, it's called "Noisy paintings". Its online resource is not as abundant as the ones that I'll soon introduce, but you can click into this site to have a glimpse into what they have to offer at the gallery:
2) National Gallery of Art
Another site that I'd like to recommend is the National Gallery of Art in Washington. I've never been to the real gallery, but this is definitely a SUPERB site for children to explore the many facets of visual art.
3) The National Gallery of Canada
Another website is supported by the government of Canada. This is FUN~~~I couldn't stop playing the game "eye spies"~~What an enjoyable way to look into the details of paintings. (the games take a bit longer to load though)