One my favorite photography stiles is Urban Exploration.

This means, that I take pictures of abandoned ruins of industrial or private buildings.

Here is an short description (thanks to wikipedia : Link):

Urban exploration (often shortened as urbex or UE) is the exploration of man-made structures, usually abandoned ruins or not usually seen components of the man-made environment. Photography and historical interest/documentation are heavily featured in the hobby and, although it may sometimes involve trespassing onto private property, this is not always the case.[1] Urban exploration is also commonly referred to as infiltration, although some people consider infiltration to be more closely associated with the exploration of active or inhabited sites