Paddington is an area in the City of Westminster, London. Three important features in the Paddington district include; London Paddington station, designed by the British Engineer Isambard Kingdom Brunel; St Mary's Hospital and Paddington Green police station (considered the most important high-security police station in the United Kingdom). Paddington Station, perhaps the most famous of the three, is a historical site having served as the London terminus of the Great Western Railway and its successors since 1838. Much of the current mainline station dates back to 1854, and was designed by Isambard Kingdom Brunel who is remembered by a seated statue that can be seen beside the side entrance to platform 1. The site was first served by Underground trains in 1863, and was the original western terminus of the Metropolitan Railway, the world's first underground railway. Possibly the most famous fictional reference to Paddington comes from Michael Bond's Paddington Bear books and in real life a statue of Paddington Bear can be found in the station concourse.