It's called the Chapel of the Holy Cross and it was finished in 1957. It has a phenomenal view from inside.
It's a Roman Catholic Chapel, so it has most of the usual attributes but somehow, beautiful though they are, they pale in comparison to that view.
Outside, the landscaping and decorations are kept very simple to blend in with the environment.
Later that day, we went back to the airport to watch the sunset, along with a couple hundred other folks who had the same idea. We got there early to get set up and get a good spot. It was everything we expected it to be and the perfect end to a really great day.