You can go to Google Images and upload your photo and it will search the internet to see where the image shows up.
It's a great way to make sure that no one is using your images wthout your permission.
Also, If you sell your photos to stock photo houses (Shutterstock, iStock, Getty), they don't tell you who is purchasing them, they just tell you that image sold. This is a way to see where they are being used.
https://images.google.com
Interesting, I found one very similar, but not exact on my theater photo. I think it's just about impossible to keep someone from using them. I have not created a website yet, and plan to in the future. I don't use any social media websites, not even facebook (gasp) :)
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