I really like the map from Wicked.
And I like how in Jersey Boys are doing the Ed Sullivan Show (Sherry) you can see them on the big screen. The whole view from behind in "Dawn" is also pretty cool.
I love the moving pilars in Light in the Piazza
I love the entire Cabaret (Revival) set.
"I wish the stage were as narrow as the wire of a tightrope dancer, so that no incompetent would dare step upon it." Goethe