Bath is a city in Somerset, England most famous for its historic baths fed by three hot springs. It is situated 99 miles (159 km) west of Central London and 13 miles (21 km) south east of Bristol. The city is founded around the only naturally occurring hot springs in the United Kingdom. It was first documented as a Roman spa, although tradition suggests that it was founded earlier. The waters from its spring were believed to be a cure for many afflictions. From Elizabethan to Georgian times it was a resort city for the wealthy. As a result of its popularity during the latter period, the city contains many fine examples of Georgian architecture, most notably the Royal Crescent. The city has a population of over 90,144 and is a World Heritage Site. Stonehenge is a prehistoric monument located in the English county of Wiltshire, about 8 miles (13 km) north of Salisbury. One of the most famous prehistoric sites in the world, Stonehenge is composed of earthworks surrounding a circular setting of large standing stones. Archaeologists believe the standing stones were erected around 2200 BC and the surrounding circular earth bank and ditch, which constitute the earliest phase of the monument, have been dated to about 3100 BC. The site and its surroundings were added to the UNESCO’s list of World Heritage Sites in 1986 in a co-listing with Avebury henge monument, and it is also a legally protected Scheduled Ancient Monument. Stonehenge itself is owned by the State and managed by English Heritage while the surrounding land is owned by the National Trust.