Hiroshima Castle

Listen first to the water. The moat around you is wide and still, and on a calm morning it holds a perfect upside-down copy of the walls above it. Somewhere a heron is fishing. Joggers pass on the gravel path behind you, and their footsteps fall soft and steady. The stone walls rise straight out of the water, built from huge, uneven blocks fitted together without mortar. This is Hiroshima Castle, and it is older than the city that grew up around it.

In fact, the castle came first, and the city followed. In the late sixteenth century, the warlord Mori Terumoto ruled much of western Japan. He wanted a new seat of power on the coast, closer to the sea routes of the Inland Sea. He chose a flat, marshy delta where the Ota River splits into several channels. Work began in 1589. Around the new fortress, merchants, craftsmen and soldiers settled, and a castle town took shape. That town became Hiroshima.

Here is something many visitors miss. Most famous Japanese castles sit on hills or mountain ridges, where height made them easier to defend. Hiroshima Castle stands on flat ground, almost at sea level. Castles of this type are called hirajiro, which simply means flatland castle. On low ground, the defence had to come from water. That is why the moats here are so broad. The river delta itself became part of the fortress.

The castle has a nickname you will hear often in the city — Carp Castle. In Japanese, it is sometimes called Rijo, using a reading of the character for carp. Nobody agrees on exactly where the name came from. One explanation links it to the old name of the land where the castle was built. Another popular tale points to the carp that lived in the moats. Either way, the fish became a symbol of Hiroshima, and the city's professional baseball team still carries the name Carp today.

Mori Terumoto did not keep his castle for long. In 1600, he was on the losing side of the Battle of Sekigahara, the great clash that decided who would rule Japan for the next two and a half centuries. The victors moved him away, and new lords arrived. After a short period under Fukushima Masanori, the castle passed to the Asano family in 1619. The Asano clan then ruled from these walls for roughly 250 years, until the samurai era ended.

After the Meiji Restoration in the late nineteenth century, when Japan dissolved its feudal domains, the castle grounds became a military site. During the First Sino-Japanese War in the 1890s, the Imperial General Headquarters moved here, and Emperor Meiji himself stayed in Hiroshima. For a short time, this quiet park was the centre of Japan's war command. Inside the grounds, you can still find foundation stones that mark where the headquarters building once stood.

That military role shaped what happened next. Through the early twentieth century, Hiroshima grew into an important army city, and the castle area filled with barracks and command buildings. The five-storey main keep survived all of this, and in 1931 it was designated a National Treasure. It was one of the few original castle towers still standing in Japan. Its dark wooden walls had watched over the city for more than three centuries.

Then came the morning of 6 August 1945. The atomic bomb exploded roughly one kilometre from here. The blast destroyed the old wooden keep completely — the tower that had stood since the sixteenth century collapsed in a moment. The military buildings around it were also wiped away. Many of the people working in the castle grounds that morning were killed. Only the stone walls and the moats remained, along with a few damaged trees that somehow lived on.

Look around you for those trees. In Hiroshima, trees that survived the bombing are called hibakujumoku, which means trees exposed to the bomb. A few of them grow within the castle grounds, and they are marked with small plaques. Their trunks may lean, or carry old scars. They are easy to walk past without noticing. But stand beside one for a moment, and you are standing beside a living witness to that morning.

The tower you see today is a reconstruction, completed in 1958. It was built in reinforced concrete, but its outer shape follows the old design closely, with white walls, dark panels and layered curved roofs. For decades, it served as a museum about the castle, the Asano lords and samurai life. In recent years, the city has studied the building's earthquake safety and discussed its future. So it is worth checking locally whether the interior is open during your visit.

Not everything here is concrete. Near the main entrance, look for the gate, the corner turret and the long connected structures along the walls. These were rebuilt in the 1990s using traditional wooden construction methods, based on old records and photographs. Compare them with the main tower. The wood has a warmer tone, the joinery is visible, and the surfaces age differently in the weather. Two approaches to rebuilding the past stand side by side within a short walk.

Inside the grounds, you will also find Hiroshima Gokoku Shrine, a Shinto shrine that was itself rebuilt after the war. On ordinary days it is calm, with the sound of wooden prayer plaques knocking together in the wind. During the New Year and on festival days, families come here in large numbers. It is a reminder that this park is not only a historic site. It is part of everyday life for the people of Hiroshima.

As you walk on, notice how close the city is. Office towers rise just beyond the trees, and you can hear traffic on the wide avenues. Yet inside the moat, the air feels cooler, and the noise drops away. The stones under your feet were laid by workers more than four hundred years ago. The tower above you was rebuilt by a city that refused to disappear.

Before you leave, stop once more at the edge of the moat. Look down at the reflection of the walls, and perhaps a carp moving slowly beneath the surface. This is where Hiroshima began — on a marshy delta, around a fortress built for war. Today, the same water carries the light of a peaceful city. Take that quiet with you as you cross the bridge and step back into the streets.