England, London, Tower Bridge viewed from the south bank of the River Thames.

England, London, Tower Bridge viewed from the south bank of the River Thames with an iconic red London bus crossing the bridge.

England, London, Tower Bridge in evening light viewed from the south bank of the River Thames with an iconic red London bus crossing the bridge.

USA, Utah, Moab, A young man slacklining or highlining hundreds of feet above Mineral Canyon during a highline gathering.

USA, Utah, Moab, Base jumpers prepare to jump from the Mothership Spacenet suspended from the cliffs 950 vertical feet above the valley floor at Mineral canyon. Another jumper rides the zipline from...

USA, Utah, Moab, A base Jumper leaps off the clifftop 950 feet above the floor of Mineral Canyon.

USA, Utah, Moab, A base Jumper leaps off the clifftop 950 feet above the floor of Mineral Canyon.

USA, Utah, Moab, A base Jumper jumps off the clifftop 950 feet above the floor of Mineral Canyon.

USA, Utah, Moab, A base jumper drops from the Mothership Space Net suspended from the cliffs 950 vertical feet above the valley floor at Mineral Canyon.

USA, Utah, Moab, Base jumpers prepare to jump from the Mothership Spacenet suspended from the cliffs 950 vertical feet above the valley floor at Mineral Canyon.

USA, Utah, Moab, A base jumper descends in his parachute off the 400 foot vertical face of the Tombstone in Kane Springs Canyon. Note his shadow on the cliff.

USA, Utah, Moab, A base jumper leaps off the 400 foot vertical face of the Tombstone in Kane Springs Canyon. He has deployed his pilot chute. Note his shadow on the cliff.