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
• Antenna
• Suspension (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 man-made buildings. Proponents of the sport often resort to subterfuge and considerable feats of climbing merely to reach their jump-off points.