Sidewalks are made a little differently here than what I am used to. Not to say that this is how they make all the sidewalks around here, but they use this method quite extensively near the center of Prague. You will notice that the guy in the picture actually has to set each individual stone. Below, is picture of a single stone, and the huge sacks which they arrive in.
The next picture is an example of where they have to actually break stones to fit the space.
And here you can see the work in progress.
Here is the final product. Notice how they lay sand on the surface which then finds its way into the cracks between the stones, and thus locking everything in place.
It is a very labor intensive, yet practical way of doing things. If the sidewalk needs to be taken up for whatever reason at a later date, the stones can be removed and then replaced. The only material used would be a little sand. They make the street the same way, but the stones are bigger. You will notice another key difference here which is that people are free to walk through the construction zone. The city assumes no liablility for a person's saftey in this case.
This is a nice Prague neighborhood, but nothing fancy. I have to say, though, it seems to be getting nicer all the time.