I was looking at these photos and thinking it looks like it has a lot of clay in it with that red color and must be great for making bricks and such with. It reminded me of Red Rocks here in Colorado. In the depression during the 1930s the government spent a lot of money building infrastructure projects to try and give people jobs, and one of those projects in this state was to make a huge theatre in the mountains:

I've only been to a concert there once but it was an amazing place to listen to music (I saw the orchestra that put on a free show there). Sometimes people do fitness challenges running up and down those stairs/seats! LOL