View unexplored locations:

Hold the Left Mouse Button when getting ready to move a unit. Move the unit over the map grid. As it passes over each grid square, coordinates and distance will be displayed, along with text associated with landmarks and cities, even if the square is unexplored (blacked out).
Map editor:

Press [Ctrl] + K during game play to enter the map editor. Enter one of the following codes to activate the corresponding effect. Note: Using this method will mark you as a cheater.
Result - Code:
Edit Faction diplomacy - [Shift] + [F9]
Full map - Y
Kill opponent - [Shift] + [F6]
Switch sides and reset view - [Shift] + [F3]
View FMV sequences - [Shift] + [F8]
View replay - [Shift] + [F7]
Change year - [Shift] + [F5]
Create unit - [Shift] + [F1]
Discovery technology - [Shift] + [F2]
Edit energy credits - [Shift] + [F4]