A huge city that's as big as some European countries and where some of its residents never get to see sunlight has gone viral ...
A giant city with some 32 million inhabitants and bigger than Austria exists on multiple levels and has its own weather ...
Chongqing in China is the largest city in the world by population. It has multi-level highways, a monorail system that cuts ...
A gigantic megacity larger than some European countries has sprung up in Southwestern China, so dense that the people living ...