What is ______ ___________?

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Across
  1. 2. There are 27 countries in this organisation (acronym)
  2. 3. The country that looks like a boot and smells like pizza. (first letter)
  3. 5. This country is known as 'the land of rabbits'. (first letter)
  4. 7. This organisation has been founded shortly after the Second World War in an attempt to maintain international peace and security. (acronym)
  5. 8. Julius Caesar was one of the leaders of this great empire.(first 2 letters)
Down
  1. 1. The treaty that ended the First World War was signed in this palace, in the Hall of Mirrors. (first 5 letters)
  2. 4. Vilnius is the capital city of this country. (first 2 letters)
  3. 6. Eiffel Tower is located in this city. (first 2 letters)