I stand to be corrected but it appears that the pits in the 1920s were, more or less, where they are today. However, the circuit changed most markedly in the early 1930s. The cars used to head from the pits down to the City of Le Mans but, from 1932 that was stopped altogether.
Instead, they went from the pits into a new layout similar, but not quite the same, as today's arrangement with the Esses leading to Tertre Rouge (Red Hillock) before Hunaudieres, or Mulsanne Straight as we call it.
The position of the finish line, where the clock was located, hasn't changed since 1923. The pits have always been after the finish and before the first right hander (Dunlop). Of course, the pits themselves have changed many times over the years. Here's an old page from 1936 showing the pit area in detail. Interestingly, the main entrance (#1 on the map to the spectator area (Tribune Bleu), runs straight across the airfield at about halfway along the pit straight.
The big track alteration mentioned by Trisha involves a detour right towards Tertre Rouge after the pits instead of continuing straight towards Le Mans. The remnants of that old straight route are still there today, just! This is an aerial pic from the 70s
All things considered it is remarkable that just 22 drivers have lost their lives at Le Mans since 1923. It's a tragedy, of course, when anyone loses his/her life, but the 24 Hours can be regarded as one of the safest of all motor racing events.
Naturally, the figure of 22 only includes drivers.
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