The Pont du Gard is a bridge 360 meters long over the Gardon River that is part of a Roman aqueduct 50 kilometers long. It was built in the 1st century A.D. to supply Nimes, France with water. Though it is no longer allowed to cross the river using the upper level, it is possible to walk the entire lower level.
The second photo was captured by my wife and post-processed by me.