Bridge House Estates
City Bridge Foundation is the working name of the historic Bridge House Estates, which originated in the late eleventh century and was formally established by royal charter in 1282 by the City of London Corporation in London, England. It is a registered charity governed by a single trustee, the City of London Corporation, represented by the City Bridge Foundation Board.

City Bridge Foundation is the working name of the historic Bridge House Estates, which originated in the late eleventh century and was formally established by royal charter in 1282 by the City of London Corporation in London, England. It is a registered charity governed by a single trustee, the City of London Corporation, represented by the City Bridge Foundation Board.
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