This is a unique historical challenge. Progress shapes and changes the locations around us, and this category was designed to share the changes through the historical record.
Your task, if you choose to accept it, is to find a public domain photo (or one you have personally taken or own), and take as close to an identical photo at the same location where the original photo was taken and in the same direction. The original photo should at least be 50 years old or older, but if the photo has uniquely changed over time a more current photo is acceptable, but will be left up to the officers to make the final decision.
Here's an example of a now and then photo of Fremont in Seattle.