Geothermal heating a total capacity of 15 GW extracted 88 PJ of heat energy for space heating. Global ground-source heat pump capacity is growing by 10% annually. Hot springs have been used for bathing at least since Paleolithic times. The oldest known spa is a stone pool on China's Mount Li built in the Qin dynasty in the 3rd century BC, at the same site where the Huaqing Chi palace was later built. Geothermal energy supplied channeled district heating for baths and houses in Pompeii around 0 AD. In the first century AD, Romans conquered Aquae Sulis in England and used the
Agua Hedionda Spa Agua Hedionda Spa The Spa of Agua Hedionda (Spanish: "Balneario de Agua Hedionda") is a mineral spring - day spa located in the city of Cuautla, in the state of Morelos, Mexico, about south of Mexico City. Agua Hedionda means in Spanish "Foul Smelling Water", and is also the name of the residential neighborhood around the spa, with approximately 10,000 inhabitants. The name was likely due to sulfur in the water. The waters originate from the melting snows of the Popocatepetl and Ixtaccihuatl volcanoes. It is probable that the spring was visited since antiquity by the Olmecs, the Teotihuacans, the