The Seto Inland Sea region is home to a large number of architectural masterpieces that have been built in response to the regionʼs unique climate, landscape, and traditions. This is because the inland sea, which Hiroshima Prefecture faces, has served as a major artery of culture and logistics throughout Japanʼs history from the time when the nation frst sent envoys to the Sui and Tang courts of China, to the time of the Joseon missions from Korea, and the Kitamaebune merchant ships of the Edo Period. Across this sea, Japan has invited people and cultures from abroad, while also transmitting its culture to the world. In addition to ancient architecture, contemporary architects such as Kenzo Tange, Fumihiko Maki, Tadao Ando, Toyo Ito, SANAA, and Shigeru Ban have created challenging and experimental masterpieces here, attracted by the unique magnetism of the Seto Inland Sea region, forged by both nature and civilization. As a result, the region is now a trove of architectural treasures, dating from ancient times to the present.