In This World is a fascinating, fictionalized documentary, in which he hired real Afghan refugees, then proceeded to make a film of them crossing from Pakistan to Iran to Turkey to Italy to France to the UK. They cross illegally in the film, but they were actually moving legally, the producers negotiated all the border crossings beforehand.

Guantanamo is a somewhat more troubling piece, as the subjects of the film, who said they were completely innocent of the charges against them, were revealed later to have likely not been telling the whole truth. Still, it's a beautifully realized docudrama recreation a la Paul Greengrass.