In the foreground of the photo, it can be seen part of the Prague astronomical clock (or Prague orloj) and in the background the Gothic towers of the Church of Our Lady before Týn.
The clock has two dials. The upper one is the astronomical clock itself and the lower (shown in more detail in the photo) is a calendar
It has four figures around it: a philosopher, an angel, an astronomer and a writer. The photo shows only the first three figures.