technically you can, if you don't care about degrees.
Free Harvard courses.
Free Courses from Stanford.
Free Courses from MIT.
Free courses from Yale.
Free courses from Princeton.
Free courses on Coursera.
Free Courses on EDx
Free Courses on Alison
For paid, there's The Great Courses+/Wonderium. 20$ a month for unlimited courses.
When searching, the phrases you're looking for are Massive Open Online Courses (MOOCs), or you can do a general search of say, "free online college courses."
Oh, and so you don't get surprised like I did, have an avoid: Hillsdale College is a conservative Christian site and not a valid MOOC place. Sign up with them and you will get things like THIS IS WHY THE LEFT IS TURNING YOUR KIDS TRANS AND GAY in your inbox.