The Great Wall of China

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Across
  1. 4. Ming _______
  2. 5. Historical structure
  3. 9. Building material
  4. 10. Large hills
  5. 11. Barter
  6. 12. Measuring a great distance
  7. 14. Sightseeing traveler
  8. 16. Military personnel
  9. 19. Southern's opposite
  10. 20. Foe
  11. 22. Wind and rain cause this
  12. 23. Guiding light
  13. 24. Trade route named after luxurious fabric (2 words)
Down
  1. 1. Lookout post
  2. 2. Where soldiers sleep
  3. 3. Access points; openings
  4. 6. Very, very old
  5. 7. Paving material
  6. 8. One of the seven ______ of the world
  7. 13. China's capital
  8. 15. Boundary
  9. 17. System of communication using fire (2 words)
  10. 18. Rock
  11. 21. Protection
  12. 22. Royal domain