A early prototype of SpaceX's next gen massive rocket took off and landed today. Though around 100 feet tall (~30 meters) this is basically just the fuel tanks of the second stage and a single engine (both the first and second stage will have more on later versions), this is testing materials, design and production methods. Most of these same concepts/components will also be used in the larger first stage that will go under this.
A version with the nose cone / payload section on top, and the first stage is under it, will be around 400 feet tall (120 meters)