The following five destination shall never be missed *Blue Lagoon :     Blue Lagoon geothermal  spa is one of the most visited attractions in Iceland. The warm waters are rich in minerals and bathing in the Blue Lagoon is reputed to help some people suffering from skin diseases. The water temperature in the bathing and swimming area of the Lagoon averages 37degC - 39degC(99F -102F). The Blue Lagoon also operates a research and development facility to help find cures for skin diseases using the mineral-rich water. *Budapest:     Budapest holds the title "City of Spas" since the year 1934, as it has more hot and medicinal water springs than any other capital city in the world. There are 118 springs in Budapest, providing over 70 million liters of hot water a day. The temperature of the waters is between 22degC and 40degC. *El Tatio:     El Tatio is a geyser  field located within the Andes Mountains of northern Chile at 4,320 meters above sea level. With over 80 active geysers, the site is the largest geyser field in the southern hemisphere and the third largest in the world. It is a major tourist attraction in Chile and is among the highest-elevation  geyser fields in the world. The temperature of the waters goes between 70degC and 85degC. *Hokkaido: Visitors to the Japanese island of Hokkaido have plenty of options. These range from top resorts with thermal baths like the Spa Resort Hawaiians to small traditional inns that have their own small hot pools with water temperature comfortable to skin. Some bathing spots are outdoors and are not associated with any spa or inn. The classic forest and mountain landscapes of this nature-rich island make it a great choice for those seeking a science setting for their baths. What is the common feature of the four places mentioned above?
They are all located in the southern part of the globe. The climate of all these places is mild most time of the year. They provide water cure for people with hot springs. They are all open-aired and close to rivers or valleys.