/ Pont du Gard in the south of France, is one of the great sights from ancient Rome, the second-highest building they ever constructed. We get a local perspective from our French guide Marc Jonas, with Provence Réservation, who explains the amazing aqueduct and the history. Pont du Gard is part of an ancient, 26 mile water channel about in length, built mostly on or beneath the ground to carry water to Nimes. The Romans constructed this bridge across the valley about 2,000 years ago to maintain an even flow of water with just a very slight change in level, dropping only about one inch every 300 feet. This engineering feat is a UNESCO World Heritage Site. The river valley here is just really quite gorgeous - you have the forest and the rocky shores on both sides, which makes it a very picturesque setting. It's a huge structure with the enormous volume of stone. It's a local limestone. It was quarried from just about a quarter-mile away from the bridge itself and there's it as much volume of solid stone here equal to the solid volume of the Eiffel tower. That's how big it is, they measured it at 21,000 m³ of rock that ways 50,000 tons huge structure. Tour conducted by Provence Reservations