Watch Mountain full movie online Movies123. Watch Mountain 123movies online for free. Mountain 123Movies: Day breaks on the eighth floor in a suburban neighbourhood of Lisbon and 14-year-old Davidâ€™s grandfather is still in hospital. Doctors give him only a few days to live. The imminence of death and the void that it will leave force David to become the man of the house, where he lives with his mother MÃ³nica, who is in her 30s, and his three-year-old sister.