I'd highly recommended John McWhorter's lectures to anyone interested in languages. I've listened to three or four of his popular-linguistics courses. There's a bit of overlap in material but I found all of them to be very informative and highly entertaining. He's such an engaging lecturer.

Edit: I'm referring to his Great Courses series. I've just looked them up and the list prices are silly. I don't know if that's still an option, but I got the audio versions on Audible for very little money.