The architecture of Liverpool is rooted in the city's development into a major port of the British Empire. It encompasses a variety of architectural styles of the past 300 years, while next to nothing remains of its medieval structures which would have dated back as far as the 13th century. Erected 1716-18, Bluecoat Chambers is supposed to be the oldest surviving building in central Liverpool.
There are over 2,500 listed buildings in Liverpool of which 27 are Grade I and 85 Grade II* listed. It has been described by English Heritage as England's finest Victorian city. However, due to neglect, some of Liverpool's finest listed buildings are on English Heritage's Heritage at Risk register.
In accordance with Liverpool's role as a trading port, many of its best buildings were erected as headquarters for shipping firms and insurance companies. The wealth thus generated led to the construction of grand civic buildings, designed to allow the local administrators to "run the city with pride".
The historical significance and value of Liverpool's architecture and port layout was recognised when, in 2004, UNESCO declared large parts of the city a World Heritage Site. Known as the Liverpool Maritime Mercantile City, the nomination papers stress the city's role in the development of international trade and docking technology, summed up in this way under Selection Criterion iv: "Liverpool is an outstanding example of a world mercantile port city, which represents the early development of global trading and cultural connections throughout the British Empire."
Liverpool's origins date back as far as the 11th century, although today nothing remains of the city's medieval architecture. Probably the earliest building of note within Liverpool would have been Liverpool Castle, which was constructed between 1232 and 1235 by William de Ferrers. The oldest surviving building within the city is likely to be Stanlawe Grange in Aigburth, a Monastic grange dating from the 13th century. Frequent modifications throughout its history mean that little of the original building remains, although sections of it are believed to date from 1291. Despite the lack of many physical remnants of this period, the city's medieval history is still evident in the street patterns around Liverpool Town Hall, with all seven of the city's original streets remaining in approximately the same position today.