The whole movie is very visually appealing and drop dead beautiful. But my favorite part from a visual perspective is when Carl’s house takes off and flies through the city and over the farms so lovely.
I have to agree with several already mentioned: particularly, the “Married Life” scenes of young Carl & Ellie on the hill, the first reveal of the balloons, and the first views of Paradise Falls.
One of my favorite shots, though, is still the moment when Carl gets the house airborne again, after emptying it out at the top of the falls - that shot of the house rising up toward the camera, with the falls below it. I love that.