The Jefferson Pools, also called Warm Springs Bathhouses and Warm Springs Pools, are two spa structures near Warm Springs, Virginia. The name was changed in the 20th century from "Warm Spring Pools" to "Jefferson Pools". The spa is part of The Homestead, a resort hotel.The Gentlemen's Pool House is the oldest spa structure in the United States. The octagonal wood building was built in 1761. The spas are naturally fed by a 98 °F (37 °C) mineral spring.