L.A. is truly the Entertainment capitol of the world. With a $28 billion entertainment industry (compared to $2.7 billion for NYC), L.A. is where the entertainment industry is at. All the movie companies (e.g. Disney, Warner Bros, Fox, Universal, Paramount, Columbia Tristar, Dreamworks) are headquartered in L.A. , tons of TV shows are produced in L.A. (like Friends, Frasier, Will & Grace), endless music videos (just watch MTV and you can count how many times you see scenes from L.A. there) , and two thirds of TV advertisements are produced in L.A.
These places are where your favorite movies and TV shows are made in (there is almost infinite history in these places!):