The San Francisco Maritime National Historical Park is located in San Francisco, California, United States. The park includes a fleet of historic vessels, a visitor center, a maritime museum, and a library/research facility. The park used to be referred to as the San Francisco Maritime Museum, however the former 1951 name changed in 1978 when the collections were acquired by the National Park Service. Today's San Francisco Maritime National Historical Park was authorized in 1988; the maritime museum is among the park's many cultural resources. The park also incorporates the Aquatic Park Historic District, bounded by Van Ness Avenue, Polk Street, and Hyde Street.

The Visitor Center is housed in the park's 1909 waterfront warehouse, located at the corner of Hyde and Jefferson streets. The City of San Francisco declared the four-story brick structure a historic landmark in 1974, and the building was listed on the National Register of Historic Places in 1975. Inside, exhibits (including a first order Fresnel lighthouse lens and a shipwrecked boat) tell the story of San Francisco's colorful and diverse maritime heritage. The visitor center also contains a theater and a ranger-staffed information desk.

The maritime museum was until recently housed in a Streamline Moderne (late Art Deco) building that is the centerpiece of the Aquatic Park Historic District, a National Historic Landmark at the foot of Polk Street and a minute's walk from the visitor center and Hyde Street Pier. The building was originally built (starting in 1936) by the WPA as a public bathhouse, and its interior is decorated with fantastic and colorful murals, created primarily by artist and color theoretician Hilaire Hiler. The architects were William Mooser Jr. and William Mooser III.

The Visitors Center, Hyde Street Pier and Maritime Museum are all situated adjacent to the foot of Hyde Street and at the western end of the Fisherman's Wharf district. The park headquarters and Maritime Research Center are located in Fort Mason, some 10 minutes walk to the west of the other sites. The Beach and Hyde Street terminal of the San Francisco cable car system adjoins the main site, while the Jones Street terminal of the F Market historic streetcar line is some 5 minutes walk to the east.

Aquatic Park is a popular place for open water swimming, both for recreation and training. The South End Rowing Club and Dolphin Club are located in Aquatic Park. Recently there have been several incidents of swimmers being bitten by sea lions.

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