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Old military batteries concentrated at the southwest corner of the island. Trails go near them, so you can wander around and go inside if you're interested.
Rotating exhibits about the history of U.S. immigration policy and the Angel Island immigration station, housed in what was once the station's hospital.
Where immigrants were held, sometimes for weeks or months, while authorities decided whether to allow them into the United States. The highlights of this museum are the numerous artifacts belonging to detainees and the poems in Chinese that some of them scratched into the walls (interpretive signs provide translations).