Puzzle

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Across
  1. 4. The country where Machu Picchu is located (4)
  2. 5. The country known for its Great Wall (5)
  3. 6. The empire ruled by Julius Caesar (5)
  4. 9. The continent with the most countries (6)
  5. 11. The battle where Napoleon was defeated in 1815 (9)
  6. 13. The first President of the United States (10)
  7. 15. The first civilization to invent democracy (6)
  8. 16. The U.S. state where the Gold Rush happened in 1849 (10)
  9. 18. The capital of Canada (6)
  10. 19. The tallest mountain in the world (7)
Down
  1. 1. The longest river in the world (7)
  2. 2. The capital of Japan (5)
  3. 3. The continent where the Amazon Rainforest is found (9)
  4. 7. The country that built the Berlin Wall (7)
  5. 8. The world's largest ocean (7)
  6. 10. The famous Italian city that had a volcanic eruption in AD 79 (6)
  7. 12. The ancient wonder, the Great Pyramid, is in this country (5)
  8. 14. The currency used in the United Kingdom (6)
  9. 17. The explorer who discovered America in 1492 (9)