This is also sometimes known as rephotography. Some of the most striking examples I've seen seamlessly blend the old and new. Such as this campus location, which really illustrates how similar people are across time: https://blogs.ubc.ca/difficultknowledge/files/2016/09/UBCLib...
That’s a nice find. Thanks for sharing.
Unfortunately it’s very hard to enjoy these kinds of blogging now that Meta have completely locked up the internet.
You can find more "then and now pictures" (rephotography) on re.photos. It has an archive of around 3000 pictures from around the world. (I developed the website as a final project during my studies. It's a bit dated but still alive and kicking.)
https://www.instagram.com/thenandnowlondon/