13 people are working on…

Richard Horne's "List of the World's Tallest Buildings to Visit"

1. 
   MattieJoeW
2. 
   lesliepantalones
3. 
   Weezo
4. 
   tassini
5. 
   Mayol
6. 
   SombreHippie
7. 
   ellkay
8. 
   Terpsikore
9. 
   kisscool57
10. 
    Cal
11. 
    EAfanatic
12. 
    KayH
13. 
    yyogini