Sydney’s skyline is large and widely recognizable. The Buildings and architecture of Sydney are not characterised by any one architectural style, having accumulated and developed over an extensive period of time. Sydney also possesses a wide array of diversity of modern and old architectural style. They range from the simple Francis Greenways Georgian buildings, to Jorn Utzon’s Expressionist, or the Sydney Opera House. Sydney also has a large amount of Victorian buildings, such as the Sydney Town Hall and the Queen Victoria Building. The most architecturally significant would be the Sydney Opera House, the Sydney Harbour Bridge, among many others. Skyscrapers in Sydney are also large and modern such as the Sydney Tower, which dominates the Sydney skyline.There are also pockets of architecturally significant housing dotted around Sydney's suburbs. The inner-eastern suburb of Paddington is known for it's terrace houses, while several inner-west suburbs contian streets lined with so-called federation houses (built around the time of Australian federation in 1901). Further away on the lower North Shore, Castlecrag is a unique suburb, being planned by the architect Walter Burley Griffin in the 1930s.