Now my server is on 1.9.4, and I want to update it to 1.10 version. We all know that 1.10 brings new features : Added Magma Block Added Nether Wart Block and Red Nether Bricks Some huge mushrooms can be even larger A rare chance to find lonely trees in plains Find abandoned mineshafts filled with gold in mesa biomes Villages generate better paths between the buildings and is there any way that I can generate Magma Block or new villages or something else in my old 1.9x maps? Some players told me that I have to delete old maps and re-generate a new map. But if I do that, all the buildings my players made are gone, and I don't want it happen. So, how can I fix that problem? Thanks!