The LEGO Architecture Landmark Series started in 2008 and consists primarily of models that represent the world's most famous structures. Initially the sets were focused on major cities in the United States such as models of the Sears Tower, John Hancock Center, the Empire State Building, and the Seattle Space Needle followed by international landmarks including Burj Khalifa, Brandenburg Gate, the Sydney Opera House and dozens more. Within the subtheme the scale of the sets differ widely.