Countries puzzle

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Across
  1. 3. Russian city with the iconic Red Square. (6)
  2. 5. The "City of Light." (5)
  3. 7. Home of a famous Opera House in Australia. (6)
  4. 9. Big Ben and the Tower Bridge are found here. (6)
  5. 11. Capital of China and home to the Forbidden City. (7)
  6. 14. North American country with a maple leaf flag. (6)
  7. 16. Largest country in South America by area. (6)
  8. 18. Birthplace of democracy and the Olympic Games. (6)
  9. 19. Italian capital known for the Colosseum. (4)
Down
  1. 1. The bustling capital of Japan. (5)
  2. 2. German capital historically divided by a wall. (6)
  3. 4. European country that shares the Iberian Peninsula with Portugal. (5)
  4. 6. East African country famous for its safaris. (5)
  5. 8. Middle Eastern city known for the Burj Khalifa. (5)
  6. 10. Land of the pharaohs and the Great Pyramids. (5)
  7. 12. European country shaped like a boot. (5)
  8. 13. The country where the Taj Mahal is located. (5)
  9. 14. Long, narrow South American country. (5)
  10. 15. The largest city on the Nile River. (5)
  11. 17. Home to the ancient Inca city of Machu Picchu. (4)