There's a new program available called Mineways, which uses open-source (read: free) software to let people turn their Minecraft creations into real-world objects.
We've seen services like this provided before, mostly for avatar recreation, but this looks way cooler, both because the software is free and because it lets you build anything from the game.
That means it's not just restricted to "objects". Because everything in the game is made of the same stuff, you can make 3D objects out of chunks of the landscape itself.
All you need is access to a 3D printer or, if that's not available, you can send it to someone like Shapeways and they'll do it for you.