To fund development there will be an IPO.
Each IPO investor will get a custom made landmark that they will be able to place where they choose that will show up on the map.
Further landmarks will can be purchased through an easy web form, which will be added to the map.
If going with an IPO, maybe look at doing something like XBC did with poloniex. It removes the trust problem of people getting their coins, no need for escrow ... people can just buy the coin directly and immediately at IPO prices. I'm not sure if Poloniex plans to do more of those, but it may be worth considering.