The expansion adds nine Civilizations, eight Wonders..., eight buildings, twenty units such as the Winged Hussars and Zulu Impi, two scenarios (American Civil War and Scramble for Africa), a new Trade Route system using Caravans and Cargo Ships trade units, Ideologies, the World Congress which expands the diplomatic aspect of the game, and an improved Cultural Victory including Tourism, Archaeology and a Great Work mechanic to the core-game. (wikipedia.org)