Though it survived six war patrols in the Pacific and an at-sea rescue of 73 POWs, the USS Pampanito is no match for the ravages of salt and wind. That’s why every seven years the San Francisco Maritime National Park Association hauls the 300-foot submarine from its perch at Pier 45 and restores it, piece by piece, to its WWII-era glory. Such meticulous upkeep and respect for original detail have earned the vessel its status as a National Historic Landmark. While the museum's crews keep the exterior free of salt erosion and smudge marks from nuzzling seals, curators use the interior as a gallery for historic artifacts that tell about the ship's accomplishments and the men who ran it. The vessel's narrow halls host the 80-man crew’s letters, memorabilia, and oral histories, as well as interactive educational programs for adults and kids. For an extended visit with history, the ship is available for educational birthday parties that offer access to otherwise restricted areas of the vessel, as well as daylong and overnight outings.