Nobody had ever seen anything like the 426-metre Elbe Tunnel when it opened in 1911. At 24 metres below the river, it transformed the lives of Hamburg’s harbour workers commuting from the right to the left bank.

The northern entrance is hard to miss at Landungsbrücken for its vivid green dome, and that Jugendstil architecture is half the tunnel’s charm.

There are two parallel tunnels for cars and pedestrians/cyclists.