this time a more easy one
not as hard as Guess#2
which tower, in which city?
- people who live in that city; traveled to that city recently or frequently are not allowed to guess it.
- google search is also not welcome, pls remind ,it's a GTC, it's not called "google-the-pic"
and btw, googling = self cheating; either u know it or u don't 
THX and good luck