Back before social media and reality television, there were still parts of America that most of us had little or no understanding of, like the Amish communities in Pennsylvania. With that as the setting, a Philadelphia cop is a stranger in his own country in “Witness” (1985). After “Star Wars,” “Indiana Jones” and “Blade Runner,” this was Harrison Ford’s first big success starring in a non-fantasy film. It’s a sturdy reworking of the old good-cops-versus-bad-cops story, made more interesting by the Amish angle featuring romantic friction between Ford and Kelly McGillis. (Keep an eye out for a Viggo Mortensen sighting.)