Deck arch bridge
An arch bridge is a bridge with abutments at each end shaped as a curved arch. Arch bridges work by transferring the weight of this bridge and its loads partially as horizontal thrust restrained by the abutments at either end, and partially as vertical loads on the arch supports. A viaduct may be made from a series of arches, although other, more economical structures are typically used today.

An arch bridge is a bridge with abutments at each end shaped as a curved arch. Arch bridges work by transferring the weight of this bridge and its loads partially as horizontal thrust restrained by the abutments at either end, and partially as vertical loads on the arch supports. A viaduct may be made from a series of arches, although other, more economical structures are typically used today.
Check the official site before travelling; hours and prices can change.
More bridges

Tower Bridge
The bridge people mean when they say London Bridge. Walk the high-level walkway for the glass floor.

Millennium Bridge
Foot-only suspension bridge from St Paul's to Tate Modern — the only crossing aligned on St Paul's dome.

Hammersmith Bridge
Currently pedestrian-only, Victorian wrought-iron beauty — best photographed at golden hour.
Source: wiki-list