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+1 to Blais' idea.

The landmarks should be taken out of gameplay completely as the system doesn't make any sense, the buildings should only be plopable via the map editor.
 
The main problem in my option is that people only walk on sideways on roads, and vanish in buildings. They no longer gather around in parks or market places like in CiM1. And even at landmarks the people just disappear instead of taking photos of the Buckingham Palace or wandering on the stairs of the Sidney Opera House.
These little things would heavily improve the ambient of the game.