Begin with the building that gives the whole place its meaning. Across the Motoyasu River stands the Genbaku Dome, and genbaku simply means atomic bomb in Japanese. It was the only structure left standing in the area where the first atomic bomb exploded on August sixth, 1945. Much of the building's exterior was stripped away, but its skeletal frame survived. What you see today is deliberate. Through the efforts of many people, including the city of Hiroshima, the Dome has been preserved in the same state as immediately after the bombing. It is inscribed as a World Heritage property that covers only four tenths of a hectare, and it is designated as a historic site under Japan's 1950 Law for the Protection of Cultural Properties. The Dome is inscribed for what it symbolizes more than for its architecture. A much larger buffer zone, 42.7 hectares, surrounds it and includes the Peace Memorial Park. City planning standards for that zone guide building height, wall colors, materials and advertisement boards, so the setting around the Dome stays worthy of its role as a symbol of peace.