In pictures: Williamson's tunnels

Descend into the maze of tunnels built under Liverpool by 19th century eccentric businessman Joseph Williamson.

The tunnellers hacked through sandstone then used blocks to line the arches

The entire maze was chiselled and dug out by hand

Some of the tunnels are corridors, others open out into "rooms"

L: Some vertical tunnels are blocked from the surface. R: Looking down from the viewing platform

These holes were for a wheel shaped wooden support to hold the roof as the arch was built

A tunnel within a tunnel intrigues - especially as the lower one leads to a dead end

The double tunnel makes a spectacular feature at the Heritage Centre

Boots, ginger beer bottles and crockery were among the 160 years of rubbish found in the tunnels

Only a small part of the network has been excavated - but it is hoped that money will raised to explore further