Hyperstaffs in the United Kingdom hosts a variety of interactive and well-designed learning activities. These cover many academic subjects, and quite a few are accessible to English Language Learners at various levels.
I’ve linked many of their individual lessons to appropriate places on my website. History-related ones that I have on my World History page include Exploring the Aztecs and Adventures in Ancient Greece.
Again, there are quite a few subjects covered. It’s worth taking a look at their main website.