The Undergrounds [Outdoor]

Did you know there used to be network of tunnels underneath Zwolle? Way back in the day it was used as an emergency exit out of the city, and in some places it still is… You are being challenged to find the entrance to these hidden tunnels. Experience Zwolle in a completely different way, prepare yourself for brainteasers and unique tasks. You might be able to discover a piece of history and possibly find the secret entrance.