The Passion of Joan of Arc (1928) is, out of the 300 films I have seen this year (not including rewatches), the single greatest cinematic experience of not just 2018 but my entire life. Absolutely nothing else like it IMO, although I wouldn't recommend it if you aren't familiar with the silent era of cinema. I love it though.
My other favourites include films such as Stanley Kubrick's 2001: A Space Odyssey (1968) for the fact it is so ahead of its time and, likewise with TPOJOA, is timeless to me. I also love A Clockwork Orange (1971), The Shining (1980), and Eyes Wide Shut (1999), which are amongst his great works.
Other favourites include Bicycle Thieves (1948), Wild Strawberries (1957), The 400 Blows (1959), Midnight Cowboy (1969), Taxi Driver (1976), Suspiria (1977), Apocalypse Now (1979), Risky Business (1983), Scarface (1983), Blue Velvet (1986), The Silence Of The Lambs (1992), American Beauty (1999), The Royal Tenenbaums (2001), Lake Mungo (2008), and Her (2013).