Expanded Epic Game: Adds a massive increase of new units, buildings, and technologies to the epic game with a tremendous amount of effort focused on the late game.
New Game Scenarios: 11 new scenarios custom-designed by the team at Firaxis and some members of the Civ Fan Community.
New Civilizations: 10 new civilizations, such as Portugal, Babylonians, and Netherlands and their associated unique units and buildings.
More Civilization Leaders: Sixteen new leaders, both for the new civilizations as well as additional leaders for existing civilizations, including Hammurabi of the Babylonians, Abraham Lincoln of the United States, and Sitting Bull of the Native Americans.
Corporations: A new game feature similar to religion allows players to found companies and spread them throughout the world. Each corporation provides benefits in exchange for certain resources.
Espionage: Now available earlier in the game, this feature offers players many new ways to spy on opponents, stir citizen unrest and defend government secrets. Events: New random events - such as natural disasters and pleas for help or demands from their citizens - challenge players with obstacles that must be overcome for their civilization to prosper.
New Wonders: Five new wonders await discovery, including the Statue of Zeus, Cristo Redentor, the Shwedagon Paya, and the Mausoleum of Maussollos.
Expanded Space Victory: Winning the race to Alpha Centauri will now require more strategic planning and tactical decision making.
Apostolic Palace: The United Nations is available earlier in the game, providing a way to win a diplomatic victory earlier. In addition, new resolutions expand the available diplomatic options.
Advanced Starts: A major fan request, this new feature enables players to 'buy' components of a custom-tailored empire and begin play in the later part of the game, allowing one to experience many of the new features of the expansion in a shorter amount of time.
Advanced AI: The greatly-enhanced AI now relies more on smart play and less on handicap bonuses to remain competitive, providing a more consistent challenge throughout the course of the game, both economically and militarily. The ways in which the AI attempt to achieve victory have also been expanded.