|The following is based on the Soviet campaign for Red Alert 2 and some details might contradict canon.|
The Eiffel tower is one of the 4 targetable monuments in the epilogue of the NOD campaign.
If the Eiffel tower is chosen, a cutscene will show the collapse of the tower under Ion Cannon strike. According to the news report that follows, more than 714 bodies have resurfaced from the rubble of the once world-famous Paris landmark.
Red Alert 2
Working like a giant Tesla Coil, when first energized, it will start firing off electrical bolts off at nearby enemy units, and also by the player's choice when selected. The energized Eiffel Tower is powerful enough to kill all units and level most buildings in a single hit.
It also appears in the multiplayer map called Paris Revisited (2-4), but it functions same as other landmarks and cannot be powered.