Goryōkaku

Listen to the gravel under your shoes. The path curves gently, then turns a sharp corner. Then it curves again. Water lies flat and dark beside you, and above it rises a sloped wall of fitted grey stone. It is quiet here. You might hear a crow, a bicycle bell, the wind in the pine branches. But the ground you walk on has a geometry you cannot feel at eye level. You are standing inside a five-pointed star.

This is Goryōkaku, a Western-style fortress in the city of Hakodate, on the southern tip of Hokkaido. The name roughly means "five-sided fort." From the ground it feels like a park of moats, walls and old trees. From the air it looks like a star pressed into the city. That shape was not decoration. Every point and every angle had a military purpose, and it came to Japan from Europe.

To understand why, go back to the 1850s. For more than two centuries, Japan had kept strict limits on contact with foreign powers. Then American warships arrived, and the Tokugawa shogunate, the military government that ruled Japan, signed treaties that opened several ports. Hakodate was one of the first. Foreign ships began to anchor in its harbour. The government needed a new administrative centre here, and it needed one that could be defended.

The man chosen to design it was Takeda Ayasaburō, a scholar trained in what the Japanese called "Dutch learning" — Western science, studied mainly through Dutch books. He looked at European fortification manuals. These described the bastion fort, a design used across Europe for centuries. Its pointed corners let defenders fire along the walls from the side, so no attacker could hide in a blind spot. Construction began in the late 1850s and took several years.

Here is the first surprise. Goryōkaku was built to the latest European theory, but it was already old-fashioned when it was finished. Star forts were designed for the age of smoothbore cannon. By the 1860s, new rifled artillery could fire farther and more accurately. Some historians also note that the fort lies within range of ships in the bay. It was a careful, intelligent design, but the world of weapons had moved on before the last stones were set.

Look closely at the stone walls as you walk. Japanese castle masons built them, using techniques from their own tradition. In some sections, the top row of stones projects outward like a ledge. This overhang was meant to stop enemies from climbing over the top. So the plan is European, but the hands and the stonework are Japanese. The fort is a meeting point of two building cultures.

At the centre of the star stood the Hakodate Magistrate's Office, the government building that managed the port and the region. The original building was taken down after the fortress lost its role. What you see today is a careful reconstruction, completed in 2010. Builders used traditional methods and old records, drawings and photographs to recreate it. Its long tiled roof and pale wooden walls look calm, almost domestic, inside such a military shape.

Now, the dramatic chapter. In 1868, Japan fell into civil war, known as the Boshin War. Forces loyal to the old shogunate fought against the new imperial government. As the shogunate's side lost ground on the main island, a naval commander named Enomoto Takeaki sailed north with ships and soldiers. They took Goryōkaku and made it their headquarters. For a few months, they ran their own administration in Hokkaido, often called the Republic of Ezo.

Among the defenders was Hijikata Toshizō, the former vice commander of the Shinsengumi, a famous samurai police force from Kyoto. Today he is a hero of novels, films, television dramas and manga. He was killed in the fighting in Hakodate in 1869, shortly before the end. Soon after, Enomoto surrendered. Here is the second surprise — Enomoto was later pardoned and served the new government as a senior official. The rebel became a minister.

After the war, the fortress had no real military use. Over time it became a public park, and in the twentieth century Japan designated it a Special Historic Site. Thousands of cherry trees were planted along the walls and moats. In spring, usually from late April into May, the star fills with pale pink blossoms. Families spread blue tarps under the branches. People eat, drink and talk until the evening turns cold.

If you want to see the star itself, look for the tall tower just outside the park. Goryōkaku Tower has an observation deck high above the fort. From there the full shape becomes clear: five sharp points, the moat around them, and the green interior. In spring the outline turns pink. In winter, snow covers everything, and the star appears white against the dark water. In the cold months, lights are often placed along the edges so the star glows at night.

Back on the ground, notice how the city has grown right up to the moat. Apartment blocks, cafés and quiet streets press close. Locals jog the outer path in the early morning. Older residents walk dogs. Students cross the bridges on their way somewhere else. For many people in Hakodate, this is not only a monument. It is simply the neighbourhood park, a place to breathe between errands.

Before you leave, stand still on one of the bridges and look along the wall. Follow the line until it turns sharply at a point and disappears. Somewhere beyond that corner, the next angle begins. The soldiers who stood here saw the same water and the same stones. Then turn around. The traffic, the trees, the voices of the people near you — this is the present, built over a star.