The Pont du Gard aqueduct bridge, located near the city of Avignon in the Provence region of France, was built in the first century AD to carry water to the Roman colony of Nemausus (Nîmes). Crossing the Gardon River near the present-day village of Vers-Pont-du-Gard, this is the highest and one of the best preserved Roman aqueduct bridges in the world. Pont du Gard is a UNESCO World Heritage Site.
After the Roman Empire collapsed, the aqueduct functioned as a toll bridge. It began attracting attention as a tourist destination in the 18th century, and today it is one of the most popular attractions in France.
Google Arts & Culture has produced a virtual walking tour of the site and also features an online exhibit where you can learn more about the history and architecture of Pont du Gard.