Yesterday, was the 15th anniversary of Béla Tarr's greatest masterpiece, Sátántangó, which world première was held on February 8th 1994 in Hungary.
Jonathan Rosenbaum wrote an article on this occasion for a Hungarian newspaper and it is published on his website too. Read it online here.
According to IMDb, it has been screened in only 7 countries (at festivals), of which only 3 gave it a (limited) commercial distribution. Hungary and The Netherlands in 1994, and France in 2003. I hope this info is incomplete. I believe there was a couple of exceptional screenings in NYC a few years ago.
Let me know where and how you could discover this rare and epic film yourself, if you had the chance to experience it.