Accurately determining where someone currently resides based on images from a bedroom without any images of the environment outside of the home is nearly impossible. On the other hand, determining where one grew up or where one was born or once lived is a different story. You could be living in the United States but have ties to Germany, therefore, you would have German (or whatever country) posters and other things from your past life in that country.
For those of you who disagree with me, keyword in the above is: accurately.
A moderator could cheat and find out where you are at this moment from your IP address, unless of course you are technically savvy and have rerouted your IP address through a proxy or mask, rendering a moderator useless.