Remote and spectacular, St Kilda lies 41 miles (66 km) west of Benbecula. It has the largest seabird colony in the north-east Atlantic, and is home to almost a million birds, including a quarter of the world's population of gannets. St Kilda also has its own subspecies of wren and field mouse, as well as a wild flock of primitive Soay sheep.
People lived on Hirta, the main island, until 1930. They depended on the seabirds; puffins were collected for their feathers and meat, young fulmars for oil and young gannets for meat.
The Ministry of Defense maintains a radar tracking station there for their missile range on Benbecula.
Find out more on St Kilda from the St Kilda website