The Time Machine

In 1899, Dr. Alexander Hartdegen builds a time machine to travel back in time and save his murdered fiancée Emma. After completing the machine in 1903, he travels back to 1899 and prevents her murder, only to see her killed again when a carriage frightens the horses of another vehicle. Realizing that any attempt to save Emma will result in her death through other circumstances, Alex travels to 2030, where holographic librarian Vox 114 insists time travel to the past is impossible. The Earth has healed, and the human race has reverted to a Stone Age-like lifestyle, with survivors called "Eloi" living on the sides of cliffs of what was once Manhattan.