Historic Sites, Places of Scenic Beauty, and Natural Monuments of Yamaguchi

Akiyoshidai in Mine, Yamaguchi, is a karst plateau of Paleozoic limestone, a Special Natural Monument since 1964, with dolines, karren and overturned strata.

Akiyoshido Cave in Mine, Yamaguchi, a Special Natural Monument since 1952, has a 1 km show route past the vast Senjojiki chamber and Hyakumaizara rimstone pools.

An early Yayoi village on the Hibiki Sea in Shimonoseki, Yamaguchi, a Historic Site since 1969, saved after destruction and a lawsuit and now a site park.

The thatched house in Hagi, Yamaguchi, where Japan's first prime minister Ito Hirobumi lived from 1854 to 1868, a Historic Site since 1932, viewable from outside.

Kagekiyo Cave in Mine, Yamaguchi, a Natural Monument since 1922, is a through-cave carrying a stream, named for a Heike warrior said to have hidden there.

On a quiet low-mountain slope in Toyoura, Shimonoseki City, lies the southernmost natural habitat of Iris rossii (Ehime Ayame) in the world. Designated a National Natural Monument of Japan in 1930, this 748.8-square-meter site is the Japanese population geographically closest to northeastern China and the Korean Peninsula, offering living evidence that the Japanese archipelago was once connected by land to the Asian continent during a colder geological era. In early April, more than 1,000 delicate blue-purple flowers bloom in unison. Combine your visit with nearby Kawatana no Kusu no Mori and Fukutoku Inari Shrine for a memorable detour to one of western Honshu's most quietly remarkable cultural-property sites.

Spanning Toyota Town in Shimonoseki City and Nagato City in Yamaguchi Prefecture, the Kiyagawa and Otozuregawa Genji Firefly Habitats are one of Japan's most important breeding grounds for the country's largest firefly, designated a National Natural Monument in 1958. Visitors can enjoy the magical sight aboard Japan's first firefly-viewing boat (the Hotarubune) or while soaking in the 600-year-old hot springs of Nagato Yumoto Onsen. Peak viewing falls around June 10 at the Kiyagawa and June 20 at the Otozuregawa.

A late Muromachi pond garden whose waterfall is carved into a 7-meter sandstone outcrop, set in a remote former mining village in northern Yamaguchi Prefecture.

Jinbayama Kofun in Shimonoseki, a Historic Site since 1991, is a 74-metre keyhole tomb thought to be the oldest in its area, with an unrobbed burial below.

The Magnetic Stone of Susa Takayama in Hagi, a Natural Monument since 1936, is gabbro on a summit so magnetic that a compass needle swings when held near.

A two-kilometre ravine in Shimonoseki where late-Cretaceous quartz porphyry forms columnar joints, designated Place of Scenic Beauty and Natural Monument in 1926.

Taisho-do, a National Natural Monument located at the northeastern edge of Akiyoshidai Quasi-National Park in Mine City, Yamaguchi Prefecture, is an extraordinary three-tiered limestone cave designated in 1923. Once known as Ushikakushi-no-Hora (Cow-Hiding Cave) where villagers hid their cattle during times of war, the vast inner chambers were discovered in 1921 by the Oshima father-and-son team. Its rare vertical structure connecting upper, middle, and lower levels, along with countless young, still-growing stalactites, makes it scientifically invaluable. Visitors enjoy a magical subterranean journey with a Magsiver audio guide and the marble-pillared wisteria walkway known as the Romance Road.

Tawarajima is a small basalt islet off Nagato's Mukatsuku Peninsula, designated in 1927 for columnar joints that stand, lean, and curve like stacked rice bales.

The Choshu Domain Maeda Battery site in Shimonoseki, a Historic Site since 2010, held guns taken by the allied fleet in 1864, turning Choshu toward opening Japan.

This Yayoi cemetery on a Yamaguchi sand dune has yielded over 300 well-preserved skeletons whose features differ from the Jomon, reshaping Japan's origin story.

The Nagato Coin Mint Site in Shimonoseki, a Historic Site since 1929, lies in Kakuonji's grounds, where Wado Kaichin coins, moulds and crucibles have been found.

The 53-kilometre Edo-period road from Hagi to Mitajiri in Yamaguchi, a Historic Site since 1989, with stone paving, milestone mounds, an honjin inn and the lord's lodge.