The Genbaku Dome -- the name means "A-Bomb Dome," derived from genbaku, the Japanese abbreviation for atomic bomb -- became the most visible structure in a landscape of total destruction. Its survival was partly architectural luck. The building's reinforced concrete walls and steel frame, designed to resist earthquakes, proved more durable than the wooden structures that dominated Hiroshima's residential and commercial districts. The bomb, aimed at the T-shaped Aioi Bridge 240 meters away, detonated instead over the nearby Shima Hospital, placing the Promotion Hall almost directly beneath the fireball. The blast's force drove straight down through the dome rather than striking it from the side. Had the detonation occurred at a greater lateral distance, the building would have been knocked flat like everything else within a two-kilometer radius. Instead, its skeleton remained upright -- a steel ribcage exposed to the sky, brick walls partially standing, the dome reduced to a framework of curved metal that gave the ruin its name.

The Dome was not immediately preserved. In the years following the bombing, Hiroshima's surviving residents were divided over what to do with the ruin. For some, it was a necessary reminder -- a physical record that the bombing had happened, visible proof against forgetting. For others, particularly those who had lost family members in and around the building, the ruin was a source of ongoing pain, a wound left open when the city was trying to heal. The debate lasted years. Demolition was scheduled along with the rest of the ruins, but the Dome's relative structural integrity delayed the work. By the time Hiroshima began its reconstruction in earnest, sentiment had shifted toward preservation. The decision was never unanimous, and the controversy it generated is itself part of the Dome's meaning: it stands not because everyone agreed it should, but because enough people decided that the discomfort of remembering was preferable to the danger of forgetting.

In December 1996, the Genbaku Dome was inscribed on the UNESCO World Heritage List, making it one of the few World Heritage Sites designated specifically for its association with destruction rather than creation. The inscription was not without opposition. Both the United States and China abstained from the vote, and some delegations questioned whether a war memorial belonged on a list dominated by palaces, temples, and natural landscapes. The Japanese government had formally recommended the Dome in December 1995, following years of petitioning by citizens' groups and hibakusha organizations. A marker placed on the Dome on April 25, 1997, by the city of Hiroshima identifies it as a site of universal significance. Two preservation projects -- notably one between October 1989 and March 1990 -- have stabilized the structure without restoring it, a distinction the conservators insist upon. The Dome is not maintained; it is prevented from collapsing further. The ruin is the point.

The Hiroshima Peace Memorial stands at the northern edge of the Peace Memorial Park, on the east bank of the Motoyasu River. Visitors approaching from the south walk past the museum, through the cenotaph, and arrive at the Dome across a bridge -- a journey designed by Kenzo Tange to build emotional weight with each step. The Dome itself cannot be entered; it is fenced off, observable only from the outside, its interior visible through the gaps in its walls. Origami cranes and flowers are frequently left at the fence. The building hosts no exhibits and offers no explanations. It simply stands, open to the rain and wind, its exposed steel beams rusting slowly, its broken walls casting the same shadows they have cast for eight decades. The leaders of the 49th G7 summit visited on May 19, 2023. Every August 6, Hiroshima's municipal government holds the Peace Memorial Ceremony in its sight. Antiwar and anti-nuclear protests gather at its base. The building that Jan Letzel designed to showcase silk and bamboo has become the most photographed ruin in the world, and the most consequential. It asks nothing of its visitors except that they look.