A series of new 3D virtual tours showing secret tunnels and vaults under parts of Wisbech, some dating back to the early medieval period, has gone online for people to view.
Fenland District Council has been working with a specialist team from the University of Lincoln to map out the tunnels under the market town as part of a project called 'Wisbech Underground'.
The 3D tour includes rooms under the town's Sessions House which used to be a court house for the town.
The floors above are now a school, but underground there are side chambers which lead to cells.
Even when we emerge from the Covid lockdown, these tunnels won't be open to the public, so the virtual tour is the only way to explore some of the town's secret subterranean spaces.