In London's Shard, the gent's toilets of the observation deck (on approx the 70th floor) have glass walls behind the urinals so if you look straight ahead while using them it is as if you are peeing on the city of London from a great height.
Image: https://d3rcx32iafnn0o.cloudfront.net/Pictures/980x653fitpad...
The three square windows under the second tier, just below where the sportingbet.com and Jaguar advertising boards meet.
But it seems like they also where used as urinals