Reddit user MC_Pitman has spent the past year revamping terrain generation in Minecraft (opens in new tab) and, judging by the results in the image above (make sure you click in the top-right to go full screen), it's time well spent.
The aim of the project was to make terrain regeneration look "more natural and realistic...more like a generated landscape than a bunch of individual biomes", they said on Reddit (opens in new tab). They've built a big world with a number of zones—the one you see above is the Alpine climate zone, which MC_Pitman says is the "most polished and complete" sector. The way the different environments meld together is gorgeous, and I'd love to build a house atop that hill in the centre.
A first release of the full world will be available "in the next few months", they said.