The Roman aqueduct of Pont du Gard is one of the greatest sights in all of ancient history. It's an incredibly impressive structure. In fact, it is the tallest ancient bridge and the second-highest structure the Romans ever built, after the Coliseum in Rome, which is just 6 feet higher.
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Not only is this a work of great engineering, but it has come down to us as one of the most important works of art of the ancient world, a work of great architecture recognized as a UNESCO World Heritage Site. It was built to carry water from the countryside into the city of Nîmes, which was a big Roman center back in those days, and it continued carrying water for five hundred years.
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