Close Encounters of the Third Kind.
Schindler's List
Miracle On 34th Street(the original)
Top Hat
The Sands of Iwo Jima
The Pride of The Yankees
Field of Dreams
E.T.
Apollo 13
Star Trek II
My Fair Lady
The King and I
The Music Man
West Side Story
Around The World in 80 Days(the original)
Its a Mad,Mad,Mad,Mad World
The Road to Singapore
Shane
Laura
Murder My Sweet
If full length theatrical released animated movies count, I some that are (imho)essential (again, LOL if you must)
Snow White
Fantasia(the original)
Cinderella
The Lady and The Tramp
Pinocchio
Bambi