Siena Cathedral (Duomo di Siena)
The marble floor stops you before anything else does. Fifty-six panels — the work of roughly forty artists across two centuries — run the length of the nave in intricate greys and whites, depicting sibyls, allegories and scenes from the Old Testament. Most of the year the panels are covered for protection, but from late June through mid-November they're revealed, and the effect is closer to walking across an illuminated manuscript than a floor.
Above you, black-and-white striped columns alternate with gold mosaics and the carved pulpit of Nicola Pisano. The Duomo took shape between 1215 and 1263, and the layers of ambition — some fulfilled, some abruptly stopped — are written into its stones.
💛 What travellers fall for
People who come back tend to time it for the floor reveal window (27 June to 31 July, or 18 August to 15 November). They also seek out the Crypt, rediscovered in 1999, where late-13th-century frescoes survive in unexpectedly vivid colour beneath the choir. The Piccolomini Library, off the left nave, is easy to pass — don't.
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Book directly at the providerHow Siena Cathedral (Duomo di Siena) came to be
Construction of the cathedral began in earnest around 1226, led initially by Giovanni Pisano, who shaped the lower façade before Camaino di Crescentino and later Giovanni di Cecco adapted and extended his plans upward. The building was consecrated as early as 1179 on the site of an older church, but the structure as it stands today took form over roughly 175 years.
In 1339, the city launched an even grander scheme: a new nave that would have made the existing cathedral merely the transept of a far larger building. Giovanni di Agostino directed the work until the Black Death arrived in 1348 and emptied the construction sites. The project was officially abandoned in 1355. The roofless shell of that expansion — the Facciatone — still stands beside the cathedral, now used as a viewing platform over the city.
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Background & history adapted from Wikipedia (CC BY-SA) · specs from Wikidata (CC0) · weather from Open-Meteo · map data © OpenStreetMap contributors · photos from Wikimedia Commons / Unsplash with per-image credit. No third-party reviews or social posts reproduced.