Sydney is Australia's largest and most cosmopolitan city. It boasts some of the most photographed landmarks in the world, a wonderland of national parks, forest mountains, and historic riverside towns. Sun-blazed beaches stretch the length of the famous harbor. One can get glittering views of an impressive city skyline once the sun goes down. Australian National Maritime Museum and the Royal Australian Airforce centre is a must visit for all those who are interested in warfare. The harbor is also home to Sydney's IMAX Theatre, Sydney Aquarium, Wildlife Sydney Zoo and Madam Tussads. Providing views of Sydney Harbour, are the Sydney Opera House and the Sydney Harbour Bridge.