Liverpool, United Kingdom
In the early 1800s, a Liverpool tobacco merchant, Joseph Williamson, funded the construction of an enormous labyrinth of tunnels under the Edge Hill area of Liverpool. Nobody knows his reasons for doing so though many guess it as an act of philanthropy, using his wealth to provide jobs and training
for thousands of Liverpool workers. There is also a Williamson's Tunnels Heritage Centre.
Listen to the audio guide for Friends Of Williamson's Tunnels Free on WIP — starts by itself when you arrive, even with the screen off