Three photographs of the waterfront in the northern Portuguese city of Porto, designated a UNESCO World Heritage site in 1996. The photographs also illustrate one of the six bridges linking Porto to Vila Nova de Gaia on the other side of the Rio Douro.

Three photographs of the waterfront in the northern Portuguese city of Porto, designated a UNESCO World Heritage site in 1996. The photographs also illustrate one of the six bridges linking Porto to Vila Nova de Gaia on the other side of the Rio Douro.

Three photographs of the waterfront in the northern Portuguese city of Porto, designated a UNESCO World Heritage site in 1996. The photographs also illustrate one of the six bridges linking Porto to Vila Nova de Gaia on the other side of the Rio Douro.