What is the primary material used to create the Baptistery in Florence?

The primary material used to create the Baptistery in Florence is marble. The structure, known as the Baptistery of Saint John, is renowned for its intricate marble façade, which showcases the impressive craftsmanship of its time. Marble has been a favored building material throughout history, particularly in Renaissance Italy, due to its durability and aesthetic qualities. The Baptistery, for instance, features beautiful geometric patterns and relief sculptures carved from different colors of marble, enhancing its visual appeal.

Using bronze, while a significant material in some elements like the famous doors, does not reflect the primary construction material of the entire structure. Wood is typically not used for substantial historical buildings due to their vulnerability to decay and fire. Glass is used primarily for windows and decorative elements, rather than as a primary structural material. Thus, marble stands out as the defining element of the Baptistery's architecture.