Where are they?

A friend send me a set of great photos, various roads. I put them here to share, please point out where are they (in comments), enjoy!!

San Francisco

2 where?

3 where?

4 Lombard Street, San Francisco

5 where?

6 where?

7 where?

8 where?

9 where?

10 where?

11 where?

12 where?

13 where?

14 where?

16 where?

15 where?

17 where?

18 where?