Architecture is a form of visual art. It is the craft, mastery, and method of designing, erecting, and contructing buildings and other free-standing structures. Architecture is also the style, manner, or attitude used to design and build a structure. Some of the more popular examples of great architecture is One Canada Square (London,England), Sears Tower (Chicago, Illinois), Smith Tower (Seattle Washington), Petronas Towers (Kuala Lumpur, Malaysia), Bank of China Tower (Hong Kong, China), St. Basil's Cathedral (Moscow,Russia), and the memorable World Trade Center (New York City, New York). Also, there are many styles of architecture including Neolithic, Ancient Greek, Baroque, Victorian, Renaissance, and Post Modern. These different styles of architecture generally refer to a period of time in which a structure was erected.