In the past I have roller coaster tycoon a lot. In that game it was possible to hide rides, support for rides,trees etc. so it was easier to build new roller coasters. If there were a "hidden tree" the game wouldt tell me so I couild delete it - even I was building a new ride.
Yesterday I had to rebuild an encolsure and because I couldne see all because of buildings - people and trees I missed one part of the fence so all the animals escaped.