University courses available to the public via MIT OpenCourseWare Master Course List

MIT OpenCourseWare | Master Course List

This is a treasure trove material if you are looking at any of these fields. If you are a teen looking at college, this is a great introduction to the material.
And if you are just looking for something new to learn this is good stuff.

A List of what they offer.
Aeronautics and Astronautics
Anthropology
Architecture
Athletics, Physical Education and Recreation
Biological Engineering
Biology
Brain and Cognitive Sciences
Chemical Engineering
Chemistry
Civil and Environmental Engineering
Comparative Media Studies
Earth, Atmospheric, and Planetary Sciences
Economics
Electrical Engineering and Computer Science
Engineering Systems Division
Experimental Study Group
Foreign Languages and Literatures
Health Sciences and Technology
History
Linguistics and Philosophy
Literature
Materials Science and Engineering
Mathematics
Mechanical Engineering
Media Arts and Sciences
Music and Theater Arts
Nuclear Science and Engineering
Physics
Political Science
Science, Technology, and Society
Sloan School of Management
Special Programs
Urban Studies and Planning
Women's Studies
Writing and Humanistic Studies