With many individuals in capacity to travel longer and further, getting something, somewhere or someone that has not been covered in depth is not an easy thing. Look for newspapers, magazines, television and internet among other sources to get a clue on what destination are most common and the images that are selling.
You should think of your return on investment. You should ask yourself if you can really make a good amount of money from the images you will take on the trip to make it financially viable. You should sum up given costs like expenses and fairs such as food and hotels. After you have analyzed everything, you can now decide whether the trip is worth your time or not.