BASE jumping

A non-competitive [adventure sport]? involving parachute jumping from either tall natural features or man-made structures. Differs from paragliding? in that the parachute is initially closed and is opened after a (short) freefall.

The name is an acronym, describing the areas desired:

• Buildings
• Antennae
• Span (bridges)
• Earth (e.g., cliffs)

The sport is highly dangerous (though perhaps less so after the design of specialised equipment), and is illegal to perform off most buildings. Proponents of the sport often resort to subterfuge and considerable feats of climbing merely to reach their jump-off points.