Welcome to Planet Earth: Population 0.
This is what our world would look like without people.
The images were created to illustrate what would happen if human life ceased tomorrow, if, for whatever reason, mankind was obliterated.
The question it raises is: how long would the remnants of our civilisation remain?
How much would we leave behind? What would an alien visitor learn about us upon landing on our planet a century or more after we had disappeared from it?
The answer, astonishingly, is: almost nothing.
Within a hundred years most traces of our modern-day lives would be so destroyed by weather, corrosion, earth tremors, surviving animals, insects and bacteria that the monuments and hieroglyphics of ancient civilisations would be better preserved than our buildings and our billions of books and electronic records.
An alien visiting Earth might well believe that the last civilisation on the planet were ancient Egyptians.
The prophetic forecast for the longevity of our 21st-century civilisation is contained in research for a History Channel documentary, Life After People.
And it's not guesswork. The two-hour special uses scientific expertise and understanding of history in order to predict the future.
Principal advisor on the TV programme is a 53-year-old Scot, Gordon Masterton, former president of the Royal Institution of Civil Engineers.
He says: "The lights will start going out around the world almost immediately. The last power will be produced by wind turbines but, after a few weeks, the planet will be plunged into a deep darkness it has not experienced since primitive Man huddled around camp fires."