Our family has greatly enjoyed using The Great Courses audio and video recorded classes. The first of The Great Courses we used was The Story of Human Language, presented by leading linguist John McWhorter, who gives 36 lectures about the development of human language, why languages change or become extinct, dialects, how languages and their grammars affect thinking, and what the study of language can tell us about history and interconnectedness of early peoples.
From there, we began listening to every Great Courses CD set the library had. They offer courses in science, math, fine arts, music, religion, philosophy, history, literature, living, language, business, and economics. But it's the course titles that are really intriguing -- such as Understanding the Universe: An Introduction to Astronomy, The Other Side of History: Daily Life in the Ancient World, Writing Creative Nonfiction, How to Listen to and Understand Opera, and nearly 400 more.