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Traditional iron-smelting technology (tatara) from the ancient Kibi Kingdom in Okayama, traditionally used for swords, was given new purpose in Hagi to produce iron for warships. The Heishin-maru is one of the ships known to be made with this iron. Today the ruins are listed as part of Hagi's World Heritage listing.
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阿字雄の滝
A unique waterfall that falls down columnal joints from the Abu Volcanoes.
明神池
A small pond at the foot of the mountain, which houses saltwater fish.
柚子屋本店
The natsumikan is a citrus fruit that's grown in many local gardens, and squeezed into a tasty juice. At Yuzuya Honten, you can buy natsumikan and other local fruits whole, enjoy them as ice cream, or lend a hand at turning them into juice or marmalade. It's on a peninsula directly north of the city — either take a cab or walk west from JR Koshigahama Station.
笠山
It is the smallest active volcano in East Asia, and offers panoramic views of the Sea of Japan. Look for the lovely camellia flowers during February and March.
萩反射炉 Hansharo
This massive furnace was built in 1858 for the production of modern weapons, but rarely used. It's partially in ruins today, but still an impressive sight.
恵美須ヶ鼻造船所跡
The shogunate had banned shipbuilding in the provinces to avoid uprisings however, as outsiders took more interest in Japan, the ban was lifted in 1853 and within a few years the Choshu Domain began building warships with new Western technology from Russia and the Netherlands. The ruins of the shipyard were registered as part of Hagi's World Heritage listing.