Box Office figures

1. Avatar (2009) $2,045,752,416

2. Titanic (1997) $1,835,300,000

3. The Lord of the Rings: The Return of the King (2003) $1,129,219,252

4. Pirates of the Caribbean: Dead Man's Chest (2006) $1,060,332,628

5. The Dark Knight (2008) $1,001,921,825

6. Harry Potter and the Sorcerer's Stone (2001) $968,657,891

7. Pirates of the Caribbean: At World's End (2007) $958,404,152

8. Harry Potter and the Order of the Phoenix (2007) $937,000,866

9. Harry Potter and the Half-Blood Prince (2009) $933,956,980

10. Star Wars: Episode I - The Phantom Menace (1999) $922,379,000

11. The Lord of the Rings: The Two Towers (2002) $921,600,000

12. Jurassic Park (1993) $919,700,000

13. Harry Potter and the Goblet of Fire (2005) $892,194,397

14. Ice Age: Dawn of the Dinosaurs (2009) $887,773,705

15. Spider-Man 3 (2007) $885,430,303

16. Shrek 2 (2004) $880,871,036

17. Harry Potter and the Chamber of Secrets (2002) $866,300,000

18. Finding Nemo (2003) $865,000,000

19. The Lord of the Rings: The Fellowship of the Ring (2001) $860,700,000

20. Star Wars: Episode III - Revenge of the Sith (2005) $848,462,555

The top 20 film of all time all have a few things in common, all for them have been made by the mojor companies, if not by them then in partenership with them. Also most of these films are fantasy, they would never happen in reality, I think this is why they have proven to be extremely popular with audiences worldwide, It gives people a chance to escape from a boring reality.