I don't remember when I last saw a black and white movie.  But Casablanca is well worth a watch for lovers of good English movies. 

Set against the backdrop of World War II, the movie portrays the romance between Rick, a Cafe owner in Casablanca and Ilsa.  Casablanca is a city in Morocco, used as a transit point for immigrants to go from France to Lisbon or to US.  Rick and Ilsa had had a period of romance in Paris abruptly broken when Nazis marched in.  Who is Laszlo that Ilsa is married to and why did she romance Rick?

Humphrey Bogart and Ingrid Bergman play Rick and Lisa. 

The movie won 3 Oscars in 1944 - Best Picture, Best Actor and Best Script/Screenplay and is in #19 in IMDB Top 250.