17 is

>! the entrance to the Rockefeller Plaza

and for a final answer:

>! Pick the $[(n-1)\pmod{10}+1]$-th letter from the $n$-th answer:  
>!  
>! 1. **G**rand Canyon  
>! 2. H**o**llywood  
>! 3. Ho**o**ver Dam  
>! 4. Nia**g**ara Falls  
>! 5. Zoca**l**o  
>! 6. Statu**e** of Liberty  
>! 7. Floren**c**e Cathedral  
>! 8. Victori**a** Harbour  
>! 9. Colliseu**m**  
>! 10. Eiffel Tow**e**r  
>! 11. **R**ijksmuseum  
>! 12. T**a**j Mahal  
>! 13. Sy**d**ney Opera House  
>! 14. Not**r**e Dame  
>! 15. Buck**i**ngham Palace  
>! 16. The Lo**v**ers Bridge  
>! 17. Rockef**e**ller Plaza  
>! 18. Red Squa**r**e  
>!  
>! **GOOGLE CAMERA DRIVER**