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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. 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. It may also be referred to as draining (when exploring drains) urban spelunking, urban caving, or building hacking.

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, including—but not limited to—invasion of privacy and certain broadly-interpreted anti-terrorism laws.

The human skull is a bony structure, part of the skeleton, that is in the human head and which supports the structures of the face and forms a cavity for the brain.

The adult human skull is said to consist of two categorical parts of different embryological origins: The neurocranium and the viscerocranium. The neurocranium (or braincase) is a protective vault surrounding the brain and brain stem. The viscerocranium (also splanchnocranium or facial skeleton) is formed by the bones supporting the face.

Except for the mandible, all of the bones of the skull are joined together by sutures, synarthrodial (immovable) joints formed by bony ossification, with Sharpey's fibres permitting some flexibility.