This idea has been mentioned during a conversation on this idea, but has not really been explained in full.
Essentially, the final product would be similar to a photo booth, but instead of being contained in a booth, cameras and printers would be installed at strategically chosen locations. These cameras would be set up in the most beautiful spots, perfect for photos. Users would then be able to pay to have the camera take a photo of them.
The idea is simple enough and once all the hardware has been installed the operation would basically run itself apart from sporadic maintenance, but there are still a few things to consider.
The cameras would need to be sturdy and protected from weather, vandals and thieves.
While the option of having a polaroid printed on the spot would be a nice touch, it might require more hardware and someone would need to refill it regularly. Another option might be to keep the photos digital, allowing users to send the photos to their phones or emails after paying.
To mechanise the process and make it easier for users to get the best photos, the camera would have to be able to adjust for the quality of light automatically, this isn't a huge problem as most digital cameras have very advanced features to do this, but it might be a problem if taking analogue photographs and printing them out.
If done well, this idea could be turned into a global brand. Tourists would know to look for these cameras at tourist attractions around the world and locals would also make use of them for capturing memories of them with their friends/loved ones.
As @Darko suggested in the conversation leading up to this idea, the cameras could be anchored to a block of concrete and protected by bulletproof glass for their protection, meaning the harware would only have to be cleaned and serviced from time to time, but other than that, it should be able to earn without having to hire any staff. So once the initial capital has been made back, there would be very little expenses for the owner and operators of these cameras.