This metal melting furnace was built to cast iron cannons. There are only two remaining reverberatory furnaces left, in Nirayama (Shizuoka Prefecture) and Hagi, making this a very valuable ruin.

This is a traditional tatara ironworks that supported the Hagi domain's Western-style shipbuilding. Tatara is a traditional Japanese method of making iron by burning iron sand with charcoal.
The iron made here was also used in the famous warship "Heishinmaru," built by the Hagi domain at the end of the Edo period.
The remains of the main facilities (such as the former hut, the high hall, the iron sand collection area, the iron pond, and the blacksmith's shop) have been well preserved, and the remains of buildings and other structures have been exposed.

The first main office was completed in 1899, two years before the founding of the Yawata Steel Works. It is a symmetrical red brick building with a central dome, and housed the director's office, the superintendent's office, and the office of a foreign consulting engineer. In 1922, as the steelworks expanded in size, the administrative functions were transferred here, and it has since been used as a steel research institute and inspection room. Currently, it is not open to the public as it is located within the steelworks premises, but in Apr. 2015, a space was opened from which one can view the former main office (completed in 1899), one of the constituent assets.

In 1910, in conjunction with the first expansion of the Yawata Steel Works, it was constructed on the east bank of the Onga River as a water source and water supply facility for the industrial water essential for steel production. The building is constructed of English-style bricks, mainly red bricks with slag bricks used as accents in some areas, and has an aesthetically pleasing design with windows of different shapes on the north and south sides. The steel-framed roof structure of the building remains the same as when the company was founded, and although its power source has changed from steam to electricity, it is still in operation.

The Mietsu Naval Dockyard is a famous facility for naval education, having built Japan's first practical steamship.
The Saga Domain ordered steam warships from the Netherlands and also planned to build its own steamships. In 1855, many Saga Domain samurai participated as naval trainees at the Nagasaki Naval Training School established by the shogunate, where they learned not only ship-handling techniques but also shipbuilding, mechanical engineering, and explosives manufacturing. The Mietsu Naval Docks are thought to have been closed in the early Meiji period, but were later used as a merchant marine school from 1902 to 1933. Today, the site is maintained as Sano Historical Park, and the remains related to the Mietsu Naval Docks are preserved underground.

[Mitsubishi Nagasaki Shipyard & Machinery Works Third Dock]
The Third Dock was completed in 1905 under Mitsubishi Limited Partnership and was the largest dock in the Orient at the time.

[Giant cantilever crane]
This is the first state-of-the-art electric crane of its kind to be installed in Japan. It is still in use today for loading steam turbines and large ship propellers manufactured at the machinery factory.

[Old wooden mold factory]
This is the oldest surviving building at the Nagasaki Shipyard and Machinery Works, constructed in 1898 as a "pattern shop" attached to the foundry. It is the largest surviving pattern shop built in the 1890s in Japan.

[Senshokaku]
This wooden Western-style building is located on the sea side of the main building of Mitsubishi Heavy Industries, Ltd.'s Nagasaki Shipyard and Machinery Works, on a hill overlooking the No. 3 Dock.

This is the remains of Japan's first steam-engine pit, which laid the foundation for Japan's coal industry. In the 19th century, Western powers including Great Britain sought to expand into Asia, and with the opening of Japan's ports, Nagasaki played a role as a coal transport and supply base for the steamships of the Western powers. Today, Takashima has many remains of coal mines, such as the pit entrances, as well as the remains of the Glover Villa, which was used as the management base for Thomas Blake Glover, who developed the Takashima coal mine.

Kosuge Ship Repair Dock was Japan's first Western-style slip dock.
The rail-mounted slide that was installed to pull up the ship using the power of a boiler-type steam engine looks like an abacus, so it is commonly called the "Soroban Dock." The winding shed is the oldest surviving brick building in Japan and is designated as a national historic site.

Miike Coal Mine is a valuable coal mine ruin that supported the modernization of Japan. In 1889, the Meiji government transferred the mine to Mitsui. Mitsui was the first to independently develop the mine. The well-preserved coal mine facilities from the Meiji period were highly evaluated, and the mine was the first to be designated as an Important Cultural Property of Japan in 1998 and as a National Historic Site in 2000.

Mikata West (old) Port is a representative civil engineering port facility of the Meiji period.
Construction began in 1884 at a total cost of 302,068 yen, and it took three years to build the road from Kumamoto to Misumi and the Misumi West (old) Port, and the port was opened on Aug. 15, 1887. This is the only port facility from the Meiji period that remains intact in Japan. In 2002, it was designated an Important Cultural Property of Japan.

It is the oldest Western-style factory in Japan, which incorporated Dutch technology.
The Shuseikan Museum, built by Shimazu Nariakira, was burned down during the Anglo-Satsuma War, but was restored by Shimazu Tadayoshi, and construction of a machinery factory began in 1864 (Genji 1) and was completed the following year in 1865 (Keio 1).
The machine factory was designated an Important Cultural Property of Japan in 1962 (Showa 37) as the Former Shuseikan Machine Factory, and a shaping machine manufactured in 1863 by a Dutch machine tool manufacturer is still on display at Shoko Shuseikan and has also been designated an Important Cultural Property.

This is the site of the charcoal kiln used to produce fuel for the Shuseikan.
As the Shuseikan project progressed, demand for charcoal increased rapidly. To prepare for the shortage, Shimazu Nariakira ordered the construction of a charcoal kiln at Yoshino Terayama, located 5 km north-northeast of Shuseikan on the north side of the Yoshino plateau in the northeast part of Kagoshima City. The remains of the charcoal kiln built in 1858 still remain in Terayama, and the main body of the kiln still retains the appearance of the time when it was built with solid masonry.

This irrigation canal stretches for about 8 kilometers from Sekiyoshi to Suzumemiya, upstream of the Abe River, and was built by Shimazu Nariakira for the Shuseikan project. The water was used as a power source, and although it now stops just before the Sanekata Bridge, the intake area still retains its original appearance.

Oshima Takato, believing that pig iron made from high-quality iron ore was necessary for cannon materials, built a Western-style blast furnace in Ohashi, Koshi-mura, Otsuchi-dori, Morioka Domain (now Ohashi, Koshi Town, Kamaishi City, Iwate Prefecture), and in 1858, he succeeded in producing pig iron continuously for the first time in Japan. The blast furnace at Hashino (now Aonoki, Hashino-cho, Kamaishi City) was built between 1858 and 1860 by the Morioka Domain, which embarked on the iron manufacturing industry based on its success. 1957, the site was designated as a national historic site as the oldest existing Western-style blast furnace in Japan.

A reverberatory furnace is a furnace used to melt metal and cast cannons. It was built by Egawa Hidetatsu (Tan'an), a magistrate during the late Edo period, and completed by his son Hidetoshi, who succeeded him. This is the only operating reverberatory furnace remaining today.