They leave their mark on bridges and underpasses, invade abandoned buildings to gain access to the top floors and scale skyscrapers by climbing from one window frame to another.

CNN: Wall art masquerades as class war

Many factory owners who couldn't afford to build new buildings because of the high cost of land and limited access to utilities converted hundreds of residential and other buildings into makeshift garment factories to keep up with the demand from Western retailers, labor groups say.

WSJ: Before Bangladesh Collapse, Some Clothing Retailers Fled Risk