The Basilique Notre-Dame de la Trinité is one of the most unusual buildings in Blois — a vast 1930s church in a stripped, almost art-deco interpretation of medieval architecture, built between 1932 and 1949 to a design by architect Paul Rouvière. The exterior is austere reinforced concrete clad in stone; the interior is unexpectedly luminous, with full-height stained glass and a vaulted concrete ceiling.
The separate bell tower rises 60 metres beside the basilica and holds a 48-bell carillon — one of the largest in France. Climb the tower (open in summer) for a high view over Blois and its outskirts. The basilica is a fifteen-minute walk north of the centre and rarely busy, so go for the architectural contrast with the cathedral as much as for the basilica itself.