Inaccessible Island

Inaccessible Island, as the name says, is an inaccessible place. It got the names thanks to Captain d'Etchevery who could not reach the shore in 1778. Although, the island was visited by whalehunters or later by the residents of Tristan da Cunha it remains uninhabited. And this is the main reason why there is great, almost untouched by any mammals, biosystem. It is even on the UNESCO list (with Gough Island). 

source: tristandc.com

Like all islands in Tristan da Cunha Archipelago, Inaccessible Island was created due to voulcanic eruption. However, this place is not active anymore. The island is about 14 km² large and the highest point (Cairn Peak) reaches 449 m. It is possible to see Tristan da cunha Island from Inaccessible, but rather hard to see the little island from the main one. The distance between them is about 45 km. It was discovered 146 years after Tristan da Cunha by Jacobszoon (Dutch), so you can imagine it is not easy to find a little bit of land on the ocean.
The problem with reaching the shore is due to high, sharp cliffs. Most expeditions trying to landfall on the Island is somehow connected with science. On the boats are biologist, geologist, ornitologist, etc. Just from time to time the residents swim there to pick apples planted years ago by the German brothers who wanted to colonised the Island (in 1971- 1973). Everytime someone whan to visit this place has to go there with local guide.

The very special animal, which live only on Inaccessible Island, is the  Inaccessible Rail, the world's smallest living flightless bird. 

source: arcticphoto.co.uk

 This Island is important also for others birds. That is why it is protected as the Important Bird Area (IBA). Besids Rails it is a place for breeding site for Rockhoopers, Albatrosses, Petrels, Tristan Trushes (or Starchy) or Shearwaters.

All the information was taken from official webpage: tristandc.com and wikipedia.en