Which famous clock adorns the town hall that borders this cache?
The answer : astronomical clock
The Prague Tourist Tour: Staroměstské náměstí geocache (GC7V42P) was hidden by Alke04 on the Old Town Square in Prague. Published in July 2018, it is one of the most visited geocaches in the world.
It enjoys an exceptional setting. The square was founded in the 10th century as a market, at the crossroads of European trading routes, and bore several names in turn before the present one. It is lined by the town hall with its astronomical clock, St Nicholas Church and the Church of Our Lady before Týn.
One thing to check before setting out: the cache is not accessible at all times, its hours following those of the building that houses it.
The answer : astronomical clock