The Roman tunnels of Sernhac

In the 1st century, between the Eure fountain in Uzès and the Castellum Divisorum in Nîmes, an aqueduct carried water via the Pont du Gard. The tunnels at Sernhac are the remains of this Roman aqueduct, more than 52 km long. Today, two of them remain accessible to the general public: the Perrotte tunnel and the Cantarelles tunnel. 74 and 60 meters long respectively, these rock-cut tunnels are buried in a lush, untamed natural environment.

You can walk through them to discover the chimneys through which the men and equipment were lowered and the rubble hauled up.
You can see the picks and oil lamp holes, as well as the misdirections.
Indeed, the teams dug back to back and could reach each other with a time lag.

Today, it's a cool, shady spot that's popular with locals.

text: https://www.midilibre.fr/2018/07/20/gard-balade-dans-les-vestiges-romains-de-sernhac,4659354.php