Just finished Zelda: Breath of the Wild.
The scope of it is amazing. Here's a GIF showing how its map compares to other games, older and newer. There is just so much landscape with so much in it - it's probably hard for someone who hasn't played this kind of genre how much there is, just what an expansive bit of world building it represents.
And just to think of it as an engineering project - 300 devs, 4 years - it's so much larger than almost anything else I can think of! It's almost amazing that it makes a profit.