Sir Edwin Lutyens designed the Thiepval Memorial to carry 72,337 names — every one a British or South African soldier of the Somme with no known grave. The arch rises 45 metres above a ridge that changed hands repeatedly between July and November 1916. Its brick and Portland stone were laid on ground where the village of Thiepval had been erased entirely. The battle opened on 1 July 1916 along a front of roughly 25 kilometres north and south of the River Somme. By nightfall the British Army had recorded 57,470 casualties, of whom 19,240 were killed — the costliest single day in its history. Fighting continued for 141 days across Beaumont-Hamel, Delville Wood, Pozières and Guillemont before the offensive closed in November mud. Advances were measured in single kilometres. What survives is a landscape of deliberate memory. The Commonwealth War Graves Commission maintains more than 240 cemeteries in the Somme sector alone, most of them small, walled and set among working beet and wheat fields. The Lochnagar Crater at La Boisselle, 91 metres wide and 21 metres deep, remains open to the sky, preserved by private purchase in 1978. At Beaumont-Hamel the Newfoundland Memorial Park keeps original trench lines under grazed turf, one of the few places where the ground itself is unrestored. A day trip from paris to somme battlefields covers this dispersed geography in a way independent travel rarely manages, since the sites lie 15 to 40 kilometres apart along narrow departmental roads. Thiepval anchors the circuit. Entry to the memorial site and grounds costs 0 EUR, and the visitor centre and grounds open 09:30–18:00 every day of the week, at 8 Rue de l'Ancre, 80300 Thiepval. That free access matters to the value calculation: on any guided day trip from paris to somme battlefields, the fare covers coach transport of roughly 180 kilometres each way, a licensed battlefield guide and the day's itinerary — not admission, because the principal Commonwealth sites charge nothing. Priced against a self-drive equivalent with fuel, tolls and a full day of navigation, the guided option generally proves the more economical use of a single day. Comparable Normandy departures share the same structure, which makes the two regions easy to weigh side by side. The names on the arch are recut on a rolling schedule; the stone is read as a register, not a monument.