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There should already be a landmark present based on the location you have given. Out of over 500 million users across nearly every country on the planet, it would be unlikely not to find the landmark you are after. Either select the landmark or choose the Add a Place option instead.
If this doesn't work, you need to re-sync the GPS on the simulated device. Instructions can be found within this gallery here.
Please read the disclaimer! You can find this and more, including the explanation - as well as the pro's and con's of using spoofed geolocation on the ZDNet iGeneration blog.