View inside Diamond Head Crater, Honolulu

Aerial view of Diamond Head, located at the eastern end of Waikiki, Honolulu, in the southeastern corner of the island of Oahu, showing Fort Ruger, military reservation established inside the crater in 1909. The base is still used for training by the Hawaii National Guard. Diamond Head, Hawaii's most recongnised landmark, is a volcanic *tuff* cone, part of a series of the Honolulu volcanic eruptions which took place approx. 100,000 years ago. A 1km, very steep walking trail to the summit of the crater rim, offers spectacular views of Honolulu and the island of Oahu. Built in 1908, the trail and Fort Ruger was part of the Oahu's coastal defense.