Everyone can stroll along the Thames, or over it, on one of the bridges. Few people know, however, that it is possible to walk under it: there is a steel tunnel that crosses the river bed 4 meters underground, in Greenwich.
A completely original way to get here and conquer the classic photo straddling the zero meridian: the exit or entrance of the Greenwich Foot Tunnel, depending on your direction, is right in front of the Cutty Sark galleon, which it will bring to mind the route to the Indies, for the tea and wool trade.