Angel Island is an island in San Francisco Bay. Originally the home of a military installation, the island now offers picturesque views of the San Francisco skyline, the Marin County Headlands and Mount Tamalpais. The entire island is included within Angel Island State Park, administered by California State Parks. The island, a California Historical Landmark, has been used for a variety of purposes, including military forts, a US Public Health Service Quarantine Station, and a US Bureau of Immigration inspection and detention facility. The Angel Island Immigration Station on the northeast corner of the island, where officials detained, inspected, and examined approximately one million immigrants, has been designated a National Historic Landmark.