Also known as Spring Festival or Lunar New Year, all of China takes vacation at once to mark the occasion, resulting in the largest human event on earth. Last year was notable as the first time more people took high-speed trains than conventional ones. Comparing Chinese New Year with America's largest annual migration is a good way to gauge its enormous size. Nevertheless, the sheer scale of "chunyun", the annual Spring Festival migration, is simply staggering. It also easily surpasses the world's largest pilgrimages in scale.

Source: Forbes February 14, 2018 13:18 UTC