Harvard University is one of the most distinguished names in education. In addition to its brick and mortar classes, they offer a variety of online courses. In fact, a number of their courses are offered for free! If you would like to stoke your passions for Shakespeare, you can take a course on Hamlet. If you are interested in public health, check out the course on the Opioid Epidemic. There are hundreds of courses to choose from. You can browse and search on their website.