In contrast to the Gothic churches of the Middle Ages like Notre-Dame (1163-1240),
the Romano-Byzantine style of Sacre Coeur is inspired by churches
such as Saint Sofia in Constantinople and San Marco in Venice.
The exterior travertine stone, known as ‘Château-Landon’,
comes from the Souppes-sur-Loing quarry in Seine et Marne
and is particular in that it is extremely hard with a fine grain
and exudes calcite on contact with rainwater,
making it white.
Basilique du Sacré Coeur