it is the last bridge on the Thames in the urban area. It was designed by Sir Horace Jones in 1886, taking into consideration the need for aesthetic harmony with the Tower of London and the requirement of a structure which could be opened, thereby permitting the passage of ships. The building work was carried out through the collaboration of John Wolfe Barry and the engineer G.D. Stevenson. Seeing the bridge being opened is now a rare sight. The Tower Bridge Museum tells the history and functioning of the bridge. The entrance to the Tower is from the northern bank of the river; there is a glass covered pedestrian walkway which takes you to the other side of the river; the view is impressive. Tower Bridge is one of the symbols of London and it offers a indescribable sight, in particular at night when thousands of lights from the City make it even more beautiful.