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Pontypridd Rail Bridge
Brunel's single span bridge over a street and the River Rhondda, contrasting with its successor alongside.
Pontypridd Old Bridge
Once the longest single-span stone arch bridge in the world
Pontypridd Station
Welsh valley station with the world's longest rail platform
Port of Tyne
Site of a major port since Roman times
Porthkerrry Viaduct, Rhoose
An elegant 16 arched viaduct built to bring coal trains to Barry, which presented severe problems during its construction.
Portland Bill Lighthouse
The first British lighthouse to be fitted with Argand lights, sited with turbulent sea on three sides.
Post Office Railway
World's first driver-less subway system, carrying mail below London's congested streets.
Potter Heigham Bridge, Norfolk
A 14th century bridge over the river Thume in the Norfolk Broads and a notorious navigational hazard. It is an Ancient Monument.
Powderhall Stables
Former stable block for horses pulling Edinburgh's waste fleet to the adjacent Powderhall Refuse Depot, a waste incineration plant constructed in 1893.
Powick Bridges, Worcester
Two bridges, the earlier dating from the 15th century listed Grade I and replaced by the second, a cast iron single span bridge of 1837 listed Grade II.