Flashback Movies are very short animated movies about historical events from a company called Flash Ones. Each well-done movie is followed by a brief text explanation of the event. They have a small collection now, which they expect to increase.
Right now the movies are accessible to Intermediate English Language Learners. I’ve made several suggestions to the creators of the site about how they could make them even more accessible, and they say they’re considering them.
These movies have the potential of being very helpful — sort of a free series of Brainpop Movies.