Tange's design organizes the park around a single visual axis. Standing at the museum on the southern end, a visitor looks north through the cenotaph -- a smooth, saddle-shaped concrete arch that shelters a stone chest containing the names of every known victim of the bombing -- and sees, framed perfectly within the arch, the skeletal ruin of the Atomic Bomb Dome across the Motoyasu River. This alignment is the park's central statement: the museum, the memorial, and the ruin connected in a single line of sight that links documentation to mourning to evidence. Nothing is accidental in this composition. The park occupies approximately 120,000 square meters on an island between two branches of the Ota River, and every monument, path, and tree is placed within a master plan that balances open space against intimate enclosures, public ceremony against private reflection.

The Memorial Cenotaph, formally known as the Hiroshima Peace City Memorial Monument, was designed by Tange in the shape of an ancient clay house -- a haniwa shelter meant to protect the souls of the dead from rain. Inside the stone chest beneath it, a register lists the names of all known victims, updated annually as more names are confirmed or as hibakusha die of radiation-related illnesses decades later. The register is never complete. Near the cenotaph burns the Peace Flame, lit on August 1, 1964, and designed to remain burning until all nuclear weapons on Earth have been eliminated. The flame's continued existence is both a symbol and an indictment: as long as it burns, the threat it memorializes persists. Every August 6, the park hosts the Hiroshima Peace Memorial Ceremony, where the mayor delivers a peace declaration, a minute of silence is observed at 8:15 a.m., and thousands of paper lanterns are floated down the river at dusk, each one bearing the name of a person who died.

The park contains dozens of individual memorials, each addressing a specific dimension of the bombing's human cost. The Children's Peace Monument honors Sadako Sasaki and the thousands of children who died, and is surrounded year-round by origami cranes sent from around the world. The Korean Atomic Bomb Victims Memorial acknowledges the tens of thousands of Korean forced laborers who were in Hiroshima at the time of the bombing -- a population whose suffering was long overlooked in Japanese memorial culture. A Peace Bell, cast with a map of the world on its surface that shows no national borders, can be rung by any visitor. The bell's sound, designated one of Japan's 100 Soundscapes by the Ministry of the Environment, carries across the park and the river. The Gates of Peace display the word "peace" in 49 languages. None of these monuments compete with the Dome or the cenotaph; they accumulate, each adding a layer of specific human reality to the park's overarching theme.

More than one million visitors walk through Hiroshima Peace Memorial Park each year. Many are Japanese schoolchildren on field trips -- the park is the most popular educational destination in the country for studying the consequences of war. International visitors come in growing numbers, and the park has become a required stop for world leaders, including the attendees of the 49th G7 summit in 2023. But the park's purpose extends beyond memorial tourism. Its peace declarations, its protest letters sent to every nation that conducts a nuclear test, its annual ceremonies -- all are acts of ongoing advocacy, not historical commemoration alone. The park exists in the present tense. The flame still burns. The register still grows. The open ground where the Nakajima district once thrived remains open, not because the city lacks the desire to build on it, but because the absence itself is the message. What was here is gone. The park asks a single question, and it asks it of everyone who enters: will you let this happen again?