Switzerland

"Grüezi mitenand!" one calls to one another here. But where does the voice come from? From the second floor, from a height of 6 meters or from the middle level? It doesn't matter where, the view of this section of the Alps is impressive. An underground train station can be found here as well as a concert by DJ Bobo or a chocolate factory by Lindt. 700 houses and bridges and 300 signals are controlled by 7 computers. Speaking of which: who will find the unicorn and the minions?
Construction area: 250sqm

Hints:
Size limit: -no limit-
Age restriction: -no restriction-

Photo: Stefam95