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With re-enactments of naval battles and other historical intrigues.
赤間神宮
A shrine dedicated to the loser of the Battle of Dan-no-ura, Emperor Antoku of the Heike Clan, whose tomb is on the premises. Aside from the impressive vermilion gate, look for Hoichi Hall and the statue of Mimi nashi Hoichi (Earless Hoichi), who features in a well-known ghost story by Lafcadio Hearn.
巌流島
This tiny island was the site of an epic samurai duel between Miyamoto Musashi and Sasaki Kojirō, two master swordsmen. Kanmon Kisen runs ferries from Karato Pier (ten minutes, ¥900 round-trip).
火の山
At 268 meters high, Hinoyama offers good views of the Kanmon Straits. There's a ropeway to the peak if you'd prefer not to hike (¥200/400 one-way/return), and a pleasant park at the top. And since there's not enough of them in the city below, you'll find a fugu restaurant (11:00-21:00) and souvenir shop (09:00-18:00) as well. Buses run from JR Shimonoseki Station.
海響館
Dolphins, penguins, and sea lions join over 100 varieties of pufferfish, with four floors of exhibits about marine science and shows throughout the day. It's right next to the Kanmon Bridge, and buses run directly there.
海峡ゆめタワー
Standing 153 meters tall, the Kaikyou Yume Tower features an observation deck in the glass sphere at the top, with panoramic views over the city and the Kanmon Straits. Internet access is available at the Yamaguchi International Exchange Association (Tu-Su 10:00-20:00).
春帆楼
The Treaty of Shimonoseki, which ended the First Sino-Japanese War, was signed on this site in 1895. There is a small museum (built in 1936) dedicated to the treaty with period furniture and some relics. It's next to an expensive ryokan (see Sleep).