Lots of lists out there:
https://en.wikipedia.org/wiki/List_o...dered_the_best
http://www.afi.com/100Years/movies.aspx
http://www.bfi.org.uk/news/50-greatest-films-all-time
I like this site, checklist of movies, create your own list to watch and keep track of, no spam emails I ever noticed, simple site, average user friendliness:
imdb top 250:
https://www.icheckmovies.com/lists/top+250/
reddit top 250:
https://www.icheckmovies.com/lists/reddit+top+250/
misc list of 1001 movies:
https://www.icheckmovies.com/lists/1...efore+you+die/
AFI and Sight and Sound are the top two, typically historically important movies get stature that's doesn't translate to enjoyment from a modern viewer. The Reddit and IMDB lists are more relevant as they get less historical context votes for movies like Citizen Kane which imo don't hold up to modern viewing. Nice thing about picking up 50 year old movies is that time has filtered all the crap.