[twentysix]

http://ecommons.library.cornell.edu/bitstream/1813/80/34/str...

http://ecommons.library.cornell.edu/bitstream/1813/80/35/str...

http://ecommons.library.cornell.edu/bitstream/1813/80/36/str...

These three lectures by Hans Bethe are really interesting to watch and gives you a historical perspective on the development of Quantum Physics. Given his age, the delivery is a bit slow, but it piques your interest in the subject.