这些景点是否有门票或费用?

1. Great Barrier Reef

2. Eiffel Tower

3. Statue of Liberty

4. Grand Canyon National Park

5. Mount Everest Base Camp

6. Great Barrier Reef

7. Machu Picchu

8. Petra

9. Angkor Wat

10. Great Barrier Reef

11. Sydney Opera House

12. Eiffel Tower

13. Statue of Liberty

14. Grand Canyon National Park

15. Mount Everest Base Camp

16. Great Barrier Reef

17. Machu Picchu

18. Petra

19. Angkor Wat

20. Great Barrier Reef

请告诉我这些景点门票价格是多少，以及如何购买门票。