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 ...

LONDON — In 1913, the British Post Office realized that London’s congested traffic was slowing down mail delivery and something needed to be done about it. (They are turning in their graves if ...

The London Underground is famous - but this traveller took a peek into the city's lesser-known and largely forgotten underground rail network. The underground rail tunnels shuttled letters and parcels ...