Alien Prequel news says:
A few weeks ago a couple of images from the much anticipated Prometheus set were leaked on to the internet. The main reaction from the images was how the set design reveals how it's obviously connected with HR Giger's designs in the original Alien.
Today I can reveal a couple of more images that show more of the obvious Giger inspiration.
Notice in the second image below how massive the set is, the chair placed there to give a sense of actually how large that entrance is. And with the placement of a green screen at the end they are obviously using special effects to enhance this feeling.
It seem the second image is taken outside an entrance to a cave, which seems to be beyond the cave entrance we saw in the first set of photos. The first image looks like it's taken inside the cave.