There is a veritable city's worth of tunnels underneath London. Many of these tunnels are secret tunnels, decommissioned military tunnels, decommissioned subway tunnels, postal tunnels, and much more.

An underground railway that was formerly used to transport post across London is to be converted into a ride for members of the public. The Post Office Underground Railway -- AKA the Mail Rail -- was ...

Join author and London tour guide Katie Wignall as she explores a huge network of abandoned underground tunnels beneath central London. Preserved by The Postal Museum, this historic subterranean ...