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Urbex is the exploration of the normally unseen or off-limits structures of urban environments or industrial facilities, such as abandoned subway tunnels, missile silos, grain elevators, asylums, schools, and amusement parks. Urban explorers often face myriad dangers in such areas, including toxic chemicals, broken glass, and collapsing floors. Arrest for trespassing is also a risk. The unspoken rule of urbex is: Take nothing but photographs; leave nothing but what? Discuss
Source: The Free Dictionary