It's a shame that this kind of interesting and interactive learning experiences have been dispersed and relegated to obscure parts of the web, instead of being part of a central repository of knowledge.

In my teens I used to spend hours marvelling at similar visualizations that were part of Encarta. Most of them were technically crude compared to what we can do today, so I feel that we lost a crucial opportunity to spread knowledge.

While Wikipedia is great, it's mostly a static repository, and pales in comparison when it comes to engagement. I think there's still a chance for an organization to curate the content on Wikipedia, and make it interactive and engaging, since Wikimedia is clearly not interested.