You may also want to look at Mark Klett's work. He incorporates old USGS photographs, well-known Ansel Adams photographs, etc., and his own to create panoramic images of the landscape. His ideas are about the landscape and time.
Did millions of people suddenly disappear? This may have an answer.
"No one knows that day or hour, not even the angels in heaven, nor the Son, but only the Father." -Matthew 24:36