I've imported the map from Zelda's Breath of the Wild to explore. It's my favorite way to test the limits of game engines.
It is scaled down as it easily maxed out the world size, and I've imported the height map in 44 pieces maxing out the chunk sizes, Bluedrake even had to increase the upload size of the website!
It is roughly textured and no villages or other non-natural landmarks save exposed mazes.
Please feel free to add details, things worth tearing down.
To optimize it I would recommend thinning out underneath the map in your voxel editor so there is less volume for it to consider.
To install just backup your castle files and replace them with this after you decompress it.
The resulting files should look like this;