Castelnau, London
Castelnau is a road in Barnes, in the London Borough of Richmond upon Thames, southwest London, approximately 5.1 miles (8.2 km) west from Charing Cross on the south side of the River Thames.

Castelnau is a road in Barnes, in the London Borough of Richmond upon Thames, southwest London, approximately 5.1 miles (8.2 km) west from Charing Cross on the south side of the River Thames.
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