Inside world’s craziest city where you never know which floor you’re on, trains run through houses & maps are useless

THE WORLD'S most unique city leaves visitors never knowing which floor they're on, and has trains running through buildings.

Chongqing, in China , is described as a "planning and engineering aberration", thanks to the fact that the ground floor of one building, could be the 20th floor of another.

“In Chongqing, the ground floor could be on the 1st, 5th, or 10th floor, depending on which side you enter from” one local said .

The city, which has been described as a "planning laboratory", has been built this way because it is situated amongst steep hills, cliffs and river valleys, where the ground height can suddenly change by hundreds of metres.

Because of this, buildings in Chongqing, which is roughly the size of Austria , often have entrances on several different stories, dependi