・The museum exhibits large numbers of documents and materials concerning Underground Christians secretly kept in the Neshiko area, situated in the west of Hirado Island.
・In addition to the history of Christianity in Hirado, exhibits include various objects of worship called “nando-gami” (gods in the closet), including valuable medals and wall scrolls borrowed from former believers living in Neshiko.
・Adjacent to the museum is Ushiwaki Forest, where an executed Christian family was buried. Still today, the forest is regarded as a sacred place, which many local residents visit to pray.