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The Pont du Gard, a Roman aqueduct, UNESCO World Heritage Site, Vers-Pont-du-Guard, Occitanie, France, Europe

Corinth Canal connecting the Gulf of Corinth in the Ionian Sea with the Saronic Gulf in the Aegean Sea, Greece

The Pont du Gard, a Roman aqueduct, UNESCO World Heritage Site, Vers-Pont-du-Guard, Occitanie, France, Europe

View over roofs of Aqueduct and Kavala Fortress and port from elevated position, Dimos Kavalas, Eastern Macedonia and Thrace, Gulf of Thasos, Gulf of Kavala, Thracian Sea, Greece, Europe

Shrine at entrance to levada tunnel (aqueduct) around Rabacal, Paul da Serra plateau, Madeira island, Atlantic Ocean, Portugal

View of Aqueduct from the Ottoman era and Kavala Fortress, Dimos Kavalas, Eastern Macedonia and Thrace, Gulf of Thasos, Gulf of Kavala, Thracian Sea, Greece, Europe

View of Aqueduct from the Ottoman era, Dimos Kavalas, Eastern Macedonia and Thrace, Gulf of Thasos, Gulf of Kavala, Thracian Sea, Greece, Europe

View towards Ponte Vittorio Emanuele II and the dome of the Saint Peters Basilica, Rome, Lazio, Italy

Corinth Canal connecting the Gulf of Corinth in the Ionian Sea with the Saronic Gulf in the Aegean Sea, Greece

The Pont du Gard, a Roman aqueduct, UNESCO World Heritage Site, Vers-Pont-du-Guard, Occitanie, France, Europe

The Pont du Gard, a Roman aqueduct, UNESCO World Heritage Site, Vers-Pont-du-Guard, Occitanie, France, Europe

The Pont du Gard, a Roman aqueduct, UNESCO World Heritage Site, Vers-Pont-du-Guard, Occitanie, France, Europe

The Pont du Gard, a Roman aqueduct, UNESCO World Heritage Site, Vers-Pont-du-Guard, Occitanie, France, Europe

Perugia's Aqueduct street with its famous bridge as seen from an alley, Perugia, Umbria, Italy, Europe

Aqueduct dug into the walls of the Siq, narrow gorge leading to the historic and archaeological Nabataean city of Petra, UNESCO World Heritage Site, Jordan, Middle East

Narrow boat on Pontcysyllte Aqueduct, UNESCO, Llangollen Canal over valley of the River Dee, Wales, United Kingdom

View of Aqueduct from Ottoman era, Dimos Kavalas, Eastern Macedonia and Thrace, Gulf of Thasos, Gulf of Kavala, Thracian Sea, Greece, Europe

View of Aqueduct from Ottoman era, Dimos Kavalas, Eastern Macedonia and Thrace, Gulf of Thasos, Gulf of Kavala, Thracian Sea, Greece, Europe

The Pont du Gard, a Roman aqueduct, UNESCO World Heritage Site, Vers-Pont-du-Guard, Occitanie, France, Europe

Corinth Canal connecting the Gulf of Corinth in the Ionian Sea with the Saronic Gulf in the Aegean Sea, Greece

The Pont du Gard, a Roman aqueduct, UNESCO World Heritage Site, Vers-Pont-du-Guard, Occitanie, France, Europe

View of Ladybower Reservoir and Baslow Edge in the distance, Peak District, Derbyshire, England, United Kingdom, Europe

Hikers on path along levada (aqueduct) of Green Cauldron (Caldeirao Verde), Madeira island, Atlantic Ocean, Portugal

Hiker on path along levada (aqueduct) of Green Cauldron (Caldeirao Verde), Madeira island, Atlantic Ocean, Portugal

Hikers on a path along levada (aqueduct) of Green Cauldron (Caldeirao Verde), Madeira island, Atlantic Ocean, Portugal

Narrow boat on Pontcysyllte Aqueduct, UNESCO, Llangollen Canal over valley of the River Dee, Wales, United Kingdom

Narrow boat on Pontcysyllte Aqueduct, UNESCO, Llangollen Canal over valley of the River Dee, Wales, United Kingdom

View of Aqueduct from Ottoman era, Dimos Kavalas, Eastern Macedonia and Thrace, Gulf of Thasos, Gulf of Kavala, Thracian Sea, Greece, Europe

View of Aqueduct from the Ottoman era and Kavala Fortress, Dimos Kavalas, Eastern Macedonia and Thrace, Gulf of Thasos, Gulf of Kavala, Thracian Sea, Greece, Europe

A couple walking in Perugia's Aqueduct street with the cityscape in the back at sunset, Perugia, Umbria, Italy, Europe

Parco degli Acquedotti, Appian Way Regional Park, Remains of Roman aqueduct Claudio (Aqua Claudia), Rome, Lazio, Italy, Europe

Narrowboat crossing the River Dee in autumn on the Pontcysyllte Aqueduct, built by Thomas Telford and William Jessop, UNESCO World Heritage Site, Froncysyllte, near Llangollen, Denbighshire, Wales, United Kingdom, Europe

View of Aqueduct from Ottoman era, Dimos Kavalas, Eastern Macedonia and Thrace, Gulf of Thasos, Gulf of Kavala, Thracian Sea, Greece, Europe

The Pont du Gard, a Roman aqueduct, UNESCO World Heritage Site, Vers-Pont-du-Guard, Occitanie, France, Europe

Steam locomotive crossing the Stanway Viaduct, Toddington, Gloucestershire, England, United Kingdom, Europe

Aqueduct in al-Siq (narrow gorge) that is the main entrance to the ancient city of Petra, UNESCO World Heritage Site, Jordan, Middle East

The eleventh aqueduct in Rome built by Emperor Alessandro Severo in 226 BC, Rome, Lazio, Italy, Europe

Basilica Cistern, Sultanahmet, UNESCO World Heritage Site, Fatih District, Istanbul Province, Turkey, Europe

The 18th century historical Aqueduct of the Free Waters (Aguas Livres Aqueduct), Lisbon, Portugal, Europe

Pegoes Aqueduct, Castle and Convent of the Order of Christ, Tomar, Santarem district, Portugal, Europe

Ribblehead Viaduct in the Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe

Pont du Gard, Roman aqueduct, UNESCO World Heritage Site, River Gard, Languedoc-Roussillon, France, Europe

Segovia's ancient Roman Aqueduct, UNESCO World Heritage Site, Segovia, Castilla y Leon, Spain, Europe

Pont du Gard, Roman aqueduct, UNESCO World Heritage Site, River Gard, Languedoc-Roussillon, southern France, France, Europe

Pont du Gard, Roman aqueduct, UNESCO World Heritage Site, River Gard, Languedoc-Roussillon, southern France, France, Europe

Pont du Gard, Roman aqueduct, UNESCO World Heritage Site, River Gard, Languedoc-Roussillon, France, Europe

Ruins of aqueduct of great nymphaeum at Roman Villa of Quintilii, Appian Way, Rome, Latium (Lazio), Italy, Europe

Pont du Gard, Roman aqueduct, UNESCO World Heritage Site, Languedoc-Roussillon, southern France, France, Europe

Aqueduct built in the 1720s and 1730s to bring water from nearby springs to Santiago de Queretaro (Queretaro), a UNESCO World Heritage Site, Queretaro, Queretaro State, Mexico, North America

Parco degli Acquedotti, Appian Way Park, remains of Roman aqueduct Claudio (Aqua Claudia), Rome, Lazio, Italy, Europe

The Roman aqueduct of Perugia at sunset, one of the main attractions of the old town, Perugia, Umbria, Italy, Europe

Whole cityscape of Spoleto, with the Roman aqueduct, the fortress and the old town, Spoleto, Umbria, Italy, Europe

Pont du Gard, Roman aqueduct, UNESCO World Heritage Site, River Gard, Languedoc-Roussillon, southern France, France, Europe

Parco degli Acquedotti, Appian Way Regional Park, Remains of Roman aqueduct Felice, Rome, Lazio, Italy, Europe

Ginger lilies in flower and Aqueduto do Carvao (aqueduct) in the background, Sao Miguel island, Azores Islands, Portugal, Atlantic, Europe

Segovia's ancient Roman Aqueduct, UNESCO World Heritage Site, Segovia, Castilla y Leon, Spain, Europe

Chirk Aqueduct, Llangollen Canal across Cieriog Valley spanning England and Wales, United Kingdom, Europe

Chirk Aqueduct, Llangollen Canal across Cieriog Valley spanning England and Wales, United Kingdom, Europe

Segovia's ancient Roman Aqueduct, UNESCO World Heritage Site, Segovia, Castilla y Leon, Spain, Europe

Roman aqueduct, the Pont du Gard, UNESCO World Heritage Site, in the Languedoc Roussillon, France, Europe

Ruins of Roman aqueduct which brought water from mountains to the city on a hill, illustrating Roman knowledge of water physics, archaeological site, Aspendos, Anatolia, Turkey, Asia Minor

Aqueduct dating from the 17th century, supplying Stari Bar, founded by Justinian in the 6th century), near modern Bar, Montenegro, Europe

Pontcysyllte Aqueduct, UNESCO World Heritage Site, Llangollen Canal, North Wales, United Kingdom, Europe