How can we look after the past

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Across
  1. 2. very problem has got a …
  2. 3. guards usually do it
  3. 4. gas from cars
  4. 6. the world heritage organization … old buildings
  5. 8. Money for entering a sight
  6. 11. vandals draw it on the walls
  7. 13. to have a …
  8. 14. place
  9. 15. destroy
Down
  1. 1. a need for…
  2. 3. we must … our history
  3. 5. … tv cameras
  4. 7. keep
  5. 9. when the ground shakes
  6. 10. when people are injured it’s…
  7. 12. a wall around something