Did you know that there was once a network of tunnels under Zwolle? These tunnels used to be used as emergency exits from the city, and in some places this is still the case… You are challenged to find the entrance to these secret tunnels. Experience Zwolle in a completely new way. Prepare for brainteasers and unique assignments. You’ll discover a bit of history, and you might even find the secret entrance!
Independent walking and puzzle route
