I recently discovered THE GREAT COURSES by accident but I am most certainly glad that I did.
These are lectures based on a college level taught by some of the best professors in the world. The lectures range on various topics. They cover:
1.) Science and Mathematics 2.) History 3.) Fine Arts & Music 4.) Religion and Theology 5.) Philosophy and Intellectual History 6.) Literature & English Language 7.) Business and Economics 8.) Better Living 9.) Professional 10.) High school
The high school courses are obviously designed to bring you to the college level of understanding of various topics.
The courses are very fun, interesting, and the professors do a good job showing its applicability in the real world.
If you enjoy learning about various topics in lecture format then I HIGHLY recommend THE GREAT COURSES