Quite an interesting exposition telling the story of the greatest nuclear disaster in history. Entrace fee - 10 UAH. You `re also able to rent an audioguide in different languages (russian, ukrainian, english, german etc.) - 50 UAH (+ 100 UAH of a deposit you`ll be given back after visiting musium). It`s worth to visit it at least once to see the reasons why people should act more sensible.