The real enjoyment of a hot water soaking bath is not in your bathtub at home, but in the natural hot springs. The earth's core is a huge heater, and natural groundwater surges out due to crustal movements. Soaking in an open-air natural hot spring is truly an enjoyable experience. Someone might say "I've seen plenty of hot springs", but the 10 iconic and unique hot springs we will take you to experience below are actually world-famous, and their uniqueness is something you wouldn't want to miss!