Shift-56 (sometimes shift 1 to 8) cheat, only available in 47*.01
It was the player-test mode for Microprose play testers. Refresh the map after pressing Shift 1-8 (by moving the cursor or pressing t twice) and you will see the map of the whole world. You can click on the cities of other players and unfortify their troops and sell their city improvements
F7 will show you the development profile of each civilization, showing you all their advances and allowing you to see if they have a vendetta against you.
F8 shows you the powergraph and allows you to see a replay up to that point.
F9 shows numbers representing the attack points, defense points, and 3 of the cities the computer uses to calculate battle, on each continent (along with giving the size of each continent in land squares.
F10 shows a complete world map.
The other function keys sometimes do their normal functions, but they mess up the display a lot of the time. Just a word of warning.