The Flying Mud Boat is a mysterious building with trees protruding from the roof. The four protruding wooden pillars are made of locally-made trees, reflecting motifs of Suwa's nature and medieval faith. Stairs for going to the library on the left, windows, etc. are also unusual. The archives are built on the grounds of Moriya, who was a priest of Suwa Taisha Shrine from ancient times who keep and publish documents that have passed down through the generations. There is also an exhibition of the the head of a deer from Suwa Shrine, which is a little grotesque. Nonetheless, The Moriya Historical Museum archives and publishes documents that have been transmitted by the Moriya family since the Kamakura period. Moriya Shihokan introduced these works by architect Terunobu Fujimori, who was born and raised here.