Fortification built on the end of Hurst Spit at the narrowest point of the Solent, opposite the Isle of Wight guarding the approaches to Southampton Port and Portsmouth harbour. First fort completed i...

Ireland, County Sligo, Gortarowey, Ben Bulben mountain with rhododendrons in the foreground.

Ireland, County Sligo, Gortarowey, Ben Bulben mountain with rhododendrons in the foreground.

Ireland, County Sligo, Gortarowey, Ben Bulben mountain with rhododendrons in the foreground.

Ireland, County Clare, The Burren, Clint blocks of limestone and gryke or grike fissures leading to a rock boulder split in two by erosion.

Ireland, County Clare, The Burren, Clint blocks of limestone and gryke or grike fissures leading to a rock boulder split in two by erosion.

Ireland, County Mayo, Downpatrick Head, Dun Briste or Broken Fort is an impressive sea stack at the headland.

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.