The Hells of Beppu in Beppu, a city on the island of Kyushu, are a series of hot springs that are too hot for bathing, but are a unique and interesting sight to see.
Hiroshima is a historic city on Japan's western coast, and is known for its Peace Memorial Park and Museum, dedicated to the victims of the atomic bombing.
Takamatsu is a city located on the island of Shikoku, and is known for its beautiful gardens, udon noodles, and art museums.