Walk under the Thames. Heading to Greenwich for a day out? While the Docklands Light Railway (DLR) will take you from Tower Hill to Cutty Sark station in the heart of Greenwich itself, get off a station early at Island Gardens and you can walk to Greenwich instead, taking the foot tunnel under the Thames. Opened in 1902, the 387 metre long tunnel, which runs about 15 metres underneath the river, was built so labourers from south London could walk to work in the docks on the Isle of Dogs and surrounding areas. Signs mark the way to the tunnel which is marked at either end by a dome at each end containing stairs and a lift. http://bit.ly/aQMujS