Not sure if this has been posted anywhere, but you can generate random images via keywords with Unsplash using the template below.
Please notice that the keyword’s spaces must be substitute by the escape character “%20”.
For example with Bosnia and Herzegovina.
Gives me this image, which is the Mehmed Paša Sokolović Bridge - a historic bridge in Višegrad, over the Drina River in eastern Bosnia and Herzegovina.
The Unsplash link works directly in the editor, no need to get the redirected URL.