Discover Siena

A concise introduction to Siena, its geography, history and culture.

Introduction

Siena is a Tuscan hill city of about 53,000 people whose entire historic centre was inscribed by UNESCO in 1995 under criteria i, ii and iv — the first of which marks it as a masterpiece of human creative genius rather than merely an important example of something. It is the most completely preserved great medieval city in Italy, and it is that for a reason most visitors never hear: Siena lost.

Before the Black Death of 1348 the city held 50,000 people. Today it holds 53,180. Nearly seven centuries later it is the same size. The plague halved it, the war with Florence finished it, and in 1555 Spanish and Florentine forces ended the Republic of Siena for good. A city that stops growing never knocks down its medieval centre to build a Renaissance one, and that is why Siena looks the way it does.

The square, and the shape of the city

Piazza del Campo is the centre of everything, a shell-shaped slope paved in brick and divided into nine segments for the Council of Nine that governed the republic. The Torre del Mangia rises from the Palazzo Pubblico on its lower edge. The square is not a monument the city preserves around itself; it is still where Siena assembles, and twice a year it becomes a racetrack.

The cathedral

The Duomo is the other reason to come, and it is startling even by Tuscan standards: banded black and white marble inside and out, an inlaid marble floor of fifty-six panels, and sculpture by Nicola and Giovanni Pisano, Donatello, Michelangelo and Bernini in one building. The complex includes the Piccolomini Library, the baptistery, the crypt and the Opera museum, run together by the Opera della Metropolitana.

The Palio is not a show

This is the thing to understand before arriving. The Palio runs on 2 July and 16 August, three laps of the Piazza del Campo in under ninety seconds, between ten of the city's seventeen contrade. It is the contrade's own event — a system of neighbourhood allegiance that organises baptisms, dinners, rivalries and debts across an entire year — and visitors are incidental to it rather than its audience. Coming for the Palio means watching something that would happen identically if nobody came.

The landscape

Siena sits at 322 metres among hills: the Chianti to the north-east and the Crete Senesi to the south-east, whose grey clay was the floor of a Pliocene sea and gives a landscape routinely described as lunar.

Geography

Siena stands at 322 metres on a set of clay ridges in central Tuscany, with the Chianti hills to the north-east and the Crete Senesi to the south-east. The Crete Senesi are the distinctive part: grey clay called mattaione, laid down as the floor of a Pliocene sea between 2.5 and 4.5 million years ago, eroded into badlands and dome-like biancane and routinely described as lunar.

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History

A Roman town called Saena Iulia under Augustus, Siena became an independent republic in the twelfth century and one of Florence's great rivals. It held 50,000 people before the Black Death of 1348 — roughly what it holds today. The plague and then the long war with Florence ended it: Spanish and Florentine forces defeated the republic in 1555, and the city has never grown since.

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Culture

Siena is organised into seventeen contrade, neighbourhood communities with their own colours, churches, fountains, museums and rivalries, into which a Sienese is baptised. They are the city's primary civic identity and they operate all year, not only for the Palio on 2 July and 16 August. The city also produced a school of painting that went a different way from Florence's — flatter, more golden, less interested in perspective — and is under-rated abroad for having lost that argument.

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How it was built and evolved over time

Siena is built of its own ground: brick made from the local clay, which is why the whole city is a single warm red-brown and why terra di Siena became a pigment name. It stopped building in the fourteenth century, and the clearest evidence is the Facciatone — a wall and one aisle of an enormous planned nave, abandoned when the Black Death of 1348 removed the people and money to finish it, and still standing in open air.

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Climate patterns

Siena has a Mediterranean climate moderated by altitude, with around 823 mm of rain a year. August averages 24.4°C and January 6.4°C, which makes winters genuinely cold for Tuscany — this is a hill city at 322 metres, not a coastal one. The surrounding clay hills turn green in spring and burn to grey-gold by July, and the autumn light over the Crete Senesi is the thing photographers come for.

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Frequently asked questions

When is the Palio, and can I just turn up? 2 July and 16 August, every year, and they do not move. Standing in the centre of Piazza del Campo is free, but it fills hours in advance and you cannot leave once it is full; seats, balconies and windows are private property with no central box office. Children may no longer stand in the centre and must watch from a stand or a window. The race itself is three laps and lasts under ninety seconds.

Is it worth coming for the Palio? Only if that is the trip. It is the contrade's own event rather than a show, the city is at its most expensive and most crowded, the four days before each race carry six trial races and the contrada dinners, and the cathedral cuts its hours. If you want to see Siena, come in May or October instead.

Is a day trip from Florence enough? It is what most people do and it is the wrong shape. Siena is steep, the coaches arrive mid-morning and leave by five, and the city only becomes itself after they have gone. One night changes the trip completely.

How hard is the walking? Harder than it looks. Siena sits at 322 metres on three ridges, the centre is largely car-free, and almost every route involves a climb. Escalators and lifts connect some of the outer car parks to the centre, which is worth using.

What does the cathedral ticket cover? The Opera della Metropolitana runs the cathedral, the Piccolomini Library, the baptistery, the crypt and the museum together, and the ticket includes a free audioguide. Hours vary by season: 10:00 to 19:00 from April to October, 10:30 to 17:30 from January to March, with the cathedral itself opening only at 13:30 on Sundays and public holidays because mass comes first.

Is there anything to do early in the morning? Yes, and it is the best thing in the city. From April to October the cathedral runs the Clavigero, its ceremonial opening at 7:15 am — the quietest anyone will ever see that building.

Verified against Wikipedia, October 2026.

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Sources & verification Covers the sourced claims on this page.

Checked against Wikipedia — The Palio is run on 2 July, for the Madonna of Provenzano, and 16 August, for the Assumption of Mary., The race is three laps of the Piazza del Campo and usually lasts no more than 90 seconds., Children are no longer allowed to stand in the middle of the piazza during the race and must watch from a stand or a window., Six trial races are run before each Palio, the first on the evening the horses are assigned and the last on the morning of the race., Siena stands at 322 metres in central Tuscany across 118.53 km², between the Crete Senesi to the south-east and Chianti to the north-east., Siena's historic centre was inscribed as a UNESCO World Heritage Site in 1995 under criteria (i), (ii) and (iv)., Siena holds 53,180 people today, against about 50,000 before the Black Death of 1348., The Republic of Siena ended in 1555 when Spanish and Florentine forces defeated it, and Tuscany passed to the Habsburg-Lorraine dynasty in 1737., Piazza del Campo is shell-shaped and the city's seventeen contrade compete in the Palio around it., The Palio is run on 2 July, for the Madonna of Provenzano, and 16 August, for the Assumption of Mary., Seventeen contrade exist but only ten compete in each Palio., The race is three laps of the Piazza del Campo and usually lasts no more than 90 seconds., Siena stands at 322 metres in central Tuscany across 118.53 km², between the Crete Senesi to the south-east and Chianti to the north-east., The Crete Senesi are the clays of Siena, grey mattaione laid down as the floor of a Pliocene sea between 2.5 and 4.5 million years ago, giving a landscape often described as lunar. (October 2026).
Checked against Opera della Metropolitana di Siena — The cathedral complex opens 10:00 to 19:00 from 1 April to 31 October and 10:30 to 17:30 from 7 January to 31 March, with the cathedral itself opening only at 13:30 on Sundays and public holidays., The cathedral ticket includes a free audioguide delivered to the visitor's own phone., From April to October the cathedral runs the "Clavigero", its ceremonial opening at 7:15 am., Siena's cathedral complex holds sculpture by Nicola and Giovanni Pisano, Donatello, Michelangelo and Bernini. (October 2026).