Atami Onsen dates back to about 1250 years ago, when hot water springs in the sea were found. Since the high- temperature water with its high salt content has excellent insulation properties, it works well for neuralgia and excessive sensitivity to cold. The water also attracts women who want to tighten up their skin and tone the body. An ancient document is noted a saying that the first Tokugawa Shogun Ieyasu (1543-1616) sojourned here; he even had the water transported to his Edo Castle in Tokyo for the purpose of bathing. The highlight of a sightseeing trip is the fireworks displays that are held several times throughout the year. In addition to its famous onsen, Atami was known for its onsen geisha. Chikurin-an-mizuno is a hot spring resort overlooking Sagami Bay, and is located just round the cape that juts out south of the main settlement of Atami.