Urban exploration (often shortened as urbex or UE) is the examination of the normally unseen or off-limits parts of urban areas or industrial facilities. It is also commonly referred to as "creeping" or infiltration, although some people consider infiltration to be more closely associated with the exploration of active or inhabited sites.
The nature of this activity presents various risks, including both physical danger and the possibility of arrest and punishment. Many, but not all, of the activities associated with Urban Exploration could be considered trespassing or other violations of local or regional laws.
an abandoned railway station
an abandoned hotel staircase
an old unused crane
abandoned castle