Germany, Hesse, Frankfurt, view of the Main river and the tower of the Kaiserdom Saint Bartholomaus or Frankfurt Cathedral with the Eiserner Steg pedestrian bridge.

Germany, Hesse, Frankfurt, St Leonhard's Roman Catholic church with the towers of the Financial District in the background seen from the Eiserner Steg bridge, it was the only one of nine churches in t...

Germany, Hesse, Frankfurt, view of the Main river and the pedestrian Eiserner Steg bridge from the tower of the post WW2 restored Frankfurt Cathedral or Frankfurter Dom, the Imperial Cathedral of Sain...

Germany, Hesse, Frankfurt, view of the Main river and the pedestrian Eiserner Steg bridge from the tower of the post WW2 restored Frankfurt Cathedral or Frankfurter Dom, the Imperial Cathedral of Sain...

Spain, Castile and Leon, Salamanca, The Roman Bridge of Salamanca with Salamanca Cathedral behind.

Spain, Castile and Leon, Segovia, Evening light streaming through the arches of the Aqueduct of Segovia, a Roman aqueduct with 167 arches built around the first century AD to channel water from spring...

Spain, Castile and Leon, Segovia, Traffic signs with the Aqueduct of Segovia, a Roman aqueduct with 167 arches built around the first century AD to channel water from springs in the mountains 17 kilom...

Spain, Castile and Leon, Segovia, Aqueduct of Segovia, a Roman aqueduct with 167 arches built around the first century AD to channel water from springs in the mountains 17 kilometres away to the city'...

Spain, Castile and Leon, Segovia, Aqueduct of Segovia, a Roman aqueduct with 167 arches built around the first century AD to channel water from springs in the mountains 17 kilometres away to the city'...

Spain, Castile and Leon, Segovia, Aqueduct of Segovia, a Roman aqueduct with 167 arches built around the first century AD to channel water from springs in the mountains 17 kilometres away to the city'...

Spain, Castile and Leon, Segovia, Early morning golden light on the Aqueduct of Segovia, a Roman aqueduct with 167 arches built around the first century AD to channel water from springs in the mountai...

Spain, Castile and Leon, Segovia, Hot air balloon gliding past as early morning golden light shines on the Aqueduct of Segovia, a Roman aqueduct with 167 arches built around the first century AD to ch...