Two kinds of quests happen simultaneously in Nostalgia for the Light , a luminous documentary by Chilean director Patricio Guzman. One takes you to the stars; the other to the ground beneath your feet. At a height of 3,000 metres, Chile's lunar-like Atacama Desert is one of the driest places on earth, its pure air allowing you to peer deep into the sky, to the frontiers of the universe. But this is also where - at the foot of the lab - women have been searching for 28 years for the remains of their family members. Sifting the sand to find traces of those who disappeared or were killed during General Pinochet's regime (1973-1992), then dumped or buried at the Chacabuco concentration camp in an arid region that was once a trade route. Read more