"Tycoon Joseph Williamson dug a vast, bizarre network of tunnels under Liverpool almost 200 years ago. Were they the city's first job creation scheme, a rich man's whimsy or a shelter from the end of the world?"

I guess we might never know, but it helps to remind us that some ancient structures and buildings might not be for worshipping or rituals - they might just be the the product of a rich guy with too much imagination, and not much sense.