Roman engineers completed the Pont du Gard around 50 AD to carry 200 million litres of water daily across the Gardon gorge — a three-tier limestone bridge that stands 48.8 metres at its highest point and stretches 275 metres bank to bank. The aqueduct supplied Nîmes from springs near Uzès, descending just 17 metres over 50 kilometres, a gradient so precise that modern surveyors struggle to replicate the calculation. Today the structure receives 1.4 million visitors annually, making it the most visited Roman monument in France and a UNESCO World Heritage site since 1985. The pont du gard day trip from avignon typically pairs the aqueduct with nearby Provençal towns — Uzès, with its medieval ducal palace and Saturday market, or Nîmes, home to the Maison Carrée temple and the Arena that still hosts bullfights. Half-day itineraries allocate 90 minutes at the bridge itself, enough to walk the lower deck, cross the river below, and visit the discovery spaces on the left bank. Full-day tours extend south to Saint-Rémy-de-Provence, where Vincent van Gogh painted 150 canvases at the Saint-Paul asylum, or east to Orange, where the Théâtre Antique preserves the only intact Roman stage wall in Europe. The aqueduct's construction required no mortar — each block weighs up to six tonnes, cut with such precision that friction alone holds the structure. Nineteenth-century roadbuilders carved through the lower tier to widen the passage for carriages, removing original stones that were never replaced. The upper channel, closed to foot traffic since 1996, carried water until the sixth century, when Frankish invasions severed maintenance networks. Calcium deposits inside the conduit measure up to 30 centimetres thick in places, evidence of five centuries of continuous flow. The site opens at 08:00 year-round, with conservation fees of €8 per adult covering access to the museum, cinema, and exhibition hall on the left bank. The bridge itself remains free to cross. Summer months see midday temperatures above 35°C, and the exposed lower tier offers no shade — morning arrivals between 09:00 and 11:00 avoid both heat and tour-bus congestion. The Gardon River below the arches remains shallow enough for wading from June through September, and the wooded paths on both banks link to longer trails through the garrigue scrubland that dominates the Gard plateau.