The Dome Standard.
The **A-Bomb Dome**, originally the Hiroshima Prefectural Industrial Promotion Hall, is a technical anomaly. Located only 160 meters from the hypocenter, the structure survived because the blast occurred almost directly above it, allowing the vertical walls to withstand the downward pressure. Today, it is archived through a specialized "Static Preservation" method, using internal steel reinforcements and resin injections to maintain its skeletal integrity exactly as it stood in the minutes following the blast.
Technical Note: The Copper Skeleton
The iconic green copper dome was shredded by the thermal wave, but the iron frame remained intact. It serves as the world's primary physical record of the first use of an atomic weapon.
Archive Spec: UNESCO Site #775
A permanent record of the destructive power of modern weaponry and a global symbol for the abolition of nuclear arms.
Engineering Spec: Floating O-Torii
The Floating Gate.
**Itsukushima Shrine** on Miyajima is a technical masterpiece of 12th-century maritime architecture. The Great Torii gate does not use foundation pillars buried in the seabed; instead, it stands on its own 60-ton weight. The pillars are hollowed out and filled with stones to lower the center of gravity, allowing the gate to remain stable during the intense tidal shifts of the Seto Inland Sea.
Heritage Fact: The Taira Legacy
Established by Taira no Kiyomori, the shrine's boardwalks were built with gaps between the floorboards to mitigate the pressure of high-tide surges.
The Peace Guardians.
Mapping the individuals and symbolic movements that transitioned Hiroshima from a site of tragedy to a global archive of hope.
Sadako Sasaki
The young catalyst behind the Children’s Peace Monument. Her technical goal of folding 1,000 paper cranes became a global archive for healing and a symbol of the innocent victims of nuclear warfare.
The Denshosha
A specialized group of 'A-bomb Legacy Successors.' These trained volunteers preserve the technical and personal records of survivors, ensuring the archive remains vocal as the original generation passes.
Mayors for Peace
An international network founded in Hiroshima. This technical diplomatic body links over 8,000 cities globally to the mission of nuclear abolition and urban safety.
Engineering Spec: Rijo (Carp Castle)
The Carp Fortress.
**Hiroshima Castle** (Rijo) represents the city's pre-modern structural archive. Built on the delta's flatlands, it utilized the six rivers as natural moats. While the original keep was destroyed in 1945, the site is archived for its **Edo-period stonework** and its role as the military headquarters for the Chugoku region during the samurai era.
Observation Tip: The Surviving Walls
Focus on the Ninomaru (Second Bailey) ruins. The stone foundations here are the original 16th-century strata, showing the technical durability of feudal masonry.
Technical Pioneers.
From high-speed logistics to metallurgical mastery: documenting the inventions born in the delta.
Rotary Engine Mastery
Mazda’s technical archive. Hiroshima engineers commercialized the Wankel Rotary Engine, a mechanical first that defined the city’s high-tech manufacturing rebirth after 1945.
Industry First • 1967Precision Needle Tech
Establishing a 90% global market share. Hiroshima invented the high-integrity polishing methods required for medical and artisanal needles, transitioning feudal ironwork into global precision tech.
Global StandardSanyo Shinkansen Vector
Hiroshima was the technical pioneer for the expansion of high-speed rail into Western Japan, engineering the mountain tunnels and delta bridges required for 300km/h transit.
Logistical Hub