Pont du Gard

The image of Roman engineering for good reason. This three-tier aqueduct bridge over the Gardon was built in the first century AD to carry water more than 50 km to Nîmes, on a channel that falls only gently along the whole route, and it still stands close to 50 meters tall. Seeing it from the riverbank shows the scale; the museum on site explains how the water was carried and its gradient kept, which turns a handsome bridge into a piece of city plumbing. The riverside setting makes it an easy half day for anyone traveling with less committed companions, and Nîmes, the city it supplied, is close by.