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The buildings and architecture of Bristol are an eclectic combination of styles, ranging from the medieval to 20th century brutalism and beyond. During the mid-19th century, Bristol Byzantine, an architectural style unique to the city was developed, of which several examples have survived. Buildings from most of the architectural periods of the United Kingdom can be seen throughout Bristol. Parts of the fortified city and castle date back to the medieval era, as do some churches dating from the 12th century onwards. As the city grew, it merged with its surrounding villages, each with its own character and centre, often clustered around a parish church. The construction of the city's floating harbour, taking in the wharves on the Avon and Frome rivers, provided a focus for industrial development and the growth of the local transport infrastructure, including the Clifton Suspension Bridge and Temple Meads railway station. The 20th century saw further expansion of the city, the growth of the University of Bristol, and the arrival of the aircraft industry. During World War II, the city centre suffered from extensive bombing during the Bristol Blitz. The redevelopment of shopping centres, office buildings, and the harbourside continues to this day.