A tube map is still used today in cities such as New York City, Washington D.C. or London that has an underground rail system. The tube map helps travelers know which route they should take to get to their destination.

Redbridge on the Central Line - which is also coloured red on the tube map.

This will depend on where you are starting from but the nearest tube station to Big Ben is Westminster which is on both the District and Circle lines (green and yellow on the tube map).

On the zwinky map you go to the inner tube out on the water.

Henry Beck (AKA Harry Beck) introduced the present London Underground Tube map in 1931. More information on Harry Beck is available here: http://en.wikipedia.org/wiki/Harry_Beck