Alcatraz Island is an island located in the San Francisco Bay, 2.4 km offshore from San Francisco, California. Often referred to as The Rock, the small island early-on served as a lighthouse, a military fortification, a military prison, and federal prison until 1963. Later, in 1972, Alcatraz became a national recreation area and received landmarking designations in 1976 and 1986.

During its 29 years of operation, the penitentiary claimed no prisoners had ever successfully escaped. 36 prisoners were involved in 14 attempts, two men trying twice; 23 were caught, six were shot and killed during their escape, and three were lost at sea and never found. The most violent occurred on May 2, 1946 when a failed escape attempt by six prisoners led to the so-called Battle of Alcatraz.
On June 11, 1962 Frank Morris, John Anglin and Clarence Anglin successfully carried out one of the most intricate escapes ever devised. Behind the prisoners' cells in Cell Block B (where the escapees were interned) was an unguarded 3-foot (0.91 m) wide utility corridor. The prisoners chiseled away the moisture-damaged concrete from around an air vent leading to this corridor, using tools such as a metal spoon soldered with silver from a dime and an electric drill improvised from a stolen vacuum cleaner motor. The noise was disguised by accordions played during music hour, and their progress was concealed by false walls which, in the dark recesses of the cells, fooled the guards.
The escape route then led up through a fan vent; the fan and motor had been removed and replaced with a steel grille, leaving a shaft large enough for a prisoner to climb through. Stealing a carborundum cord from the prison workshop, the prisoners had removed the rivets from the grille and substituted dummy rivets made of soap. The escapees also constructed an inflatable raft from several stolen raincoats for the trip to the mainland. Leaving papier-mâché dummies in their cells with stolen human hair from the Barbershop for hair, they escaped. The prisoners are estimated to have entered San Francisco Bay at 10 p.m. Articles belonging to the prisoners (including plywood paddles and parts of the raincoat raft) were located on nearby Angel Island, and the official report on the escape says the prisoners drowned while trying to reach the mainland in the cold waters of the bay.

Beginning on November 20, 1969, a group of Native Americans from many different tribes (many individual Native Americans relocated to the Bay Area under the Federal Indian Reorganization Act of 1934), occupied the island, and proposed an education center, ecology center and cultural center. According to the occupants, the Treaty of Fort Laramie (1868) between the U.S. and the Sioux returned all retired, abandoned or out-of-use federal land to the Native people from whom it was acquired. In fact, the Sioux Treaty of 1868 stated that all abandoned or unused federal land adjacent to the Sioux Reservation could be reclaimed by descendant of the Sioux Nation. For that reason, the group Indians of All Tribes abandoned the Sioux treaty as the basis of their occupation and claimed Alcatraz Island by Right of Discovery.
If you look careful at the picture below you can actually see the word "FREE", which was writen in the American flag by the Indian Occupants.

While on Alcatraz I had the opportunity to meet one of the former inmates. Darwin E Coon was incarcerated in Alcatraz from 1959 till 1963 and he returned to promote his compelling life story which he worte in the book: "Alcatraz - The true end of the line". A very interesting read!