The town of Pripyat in Ukraine. It was built in the1970s to provide homes for the workers employed in the Soviet nuclear power station at Chernobyl. In April 1986, one of the reactors exploded and the entire population had to be evacuated immediately. The wrecked reactor, seen above on the horizon, has now been enclosed within a giant arched structure of concrete to restrict still dangerous emissions. (© Kieran O’Donovan)