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
The Street (Derbyshire) Little Chester, the site of the Roman settlement of "Derventio". The Romans built farmsteads near the Street, to feed the soldiers and growing population in the area. Remains of a farm have been found near Minninglow. The Street (Derbyshire) The Street is the medieval name of the Roman road that ran through the Peak District of Derbyshire from the spa town of Buxton (Latin "Aquae Arnemetiae") southeast towards modern Derby. The line of the road can be traced from surviving features, confirmed by archaeology, from Buxton as far as just north of Brassington. It is believed that from Brassington the