There were a lot of best movies...It depend on individual taste...here is the best of in all genres....look for your favorite among this....
Best Action/Adventure-Indiana Jones Trilogy
Best Adaptation- Spiderman Trilogy
Best Animation-Shrek 1&2
Best Biopic-The Ten Commandments (1956)
Best Classics-Gone With the Wind (1939)
Best Comedy-Dumb and Dumber(1994)
Best Crime/Gangster-The Godfather Trilogy
Best Documentary-The Fog of War (2003)
Best Drama-Schindler's List(1993)
Best Historical Epic-Ben-Hur (1959)
Best Kids/Family -E.T. the Extra-Terrestrial (1982)
Best Musical- The Sound of Music (1965)
Best Religion-The Passion of the Christ (2004)
Best Remake-King Kong (2005)
Best Romance-Titanic (1997)
Best Science Fiction-Starwars(all six!!)
Best Fantasy-Lord of the Ring Trilogy
Best Sequel -Back to the Future II(1989)
Best Sports-Rocky Anthology
Best Suspense/Horror- Ringu Of Terror (2005)
Best Teen-American Pie Trilogy
Best Thriller-Silence of the Lambs (1991)
Best War-Saving Private Ryan (1998)
Best Western-The good, the bad and the Ugly(1968)
Best Monster-Aliens qualilogy
Best disaster-The day after tomorrow(2004)
Those were unforgettable classic.....highly recommended