Yamaguchi's Meiji era sites added to World Heritage list
Unesco decides to add Japan's Meiji sites to World Heritage list
These include Yamaguchi's 5 sites: Hagi Castle Town, Shokasonjuku Academy, Oitayama-tatara iron smelting works, Ebisugahana shipyard and Hagi reverberatory furnace, making them the first World Heritage Sites to be listed in Yamaguchi Prefecture.
These sites are quite important showing us how Japan's modernization, also, Asia's first autonomous modernization began.
Shokasonjuku Academy, a mere tiny shed below, is a private academy where young ambitious students discussed and learned how to modernize samurai ruled Japan. Those students eventually realized the modernization of Japan and became the first cabinet ministers of Japan.
Hagi Castle Town, an area where you can still touch the atmosphere of samurai-era Hagi, preserves residences of some students of Shokasonjuku Academy, other wealthy merchants, and samurais in the late Edo period.
These sites give us some clues of how Japan, as well as Asia, has become a prosperous region and the manufacturing hub of the world. I think it's worth a visit for people all over the world.
There are also beautiful seashores like below (Tsunoshima) around the region, so I recommend you combine those historical sites with outdoor adventure on your trip.