Below are some amazing Flickr sets 20 years on.
From National Geographic:
Despite Mutations, Chernobyl Wildlife Is Thriving
Twenty years ago today, reactor number four at the Chernobyl Nuclear Power Plant exploded. The blast covered vast areas of Belarus, Ukraine, and Russia (see map) with dangerous radioactive material. The effects of the Chernobyl catastrophe are still being felt today—whole towns lie abandoned, and cancer rates in people living close to the affected areas are abnormally high.