The BBC has been teaching English for 70 years, and to celebrate they have published a number of special programmes. You can find them all here.
English teaching/learning websites come and go, but in my opinion BBC Learning English remains the best all round internet resource for learners of English. There's an incredible wealth of material at all levels, and some of the archives go back to 1999! So Happy Birthday to @bbcle and good luck for the next 70 years!