NOT TO BE MISSED. Best cathedral we saw in our entire trip to Florence. Highly recommend! Beautiful and stunning outside, interesting inside. Siena is a really great place to visit for a true feel for a mideival town that's not as bustling and busy as Florence.

This huge cathedral can be seen easily from a distance but as you get closer to it, it becomes hidden by the surrounding buildings until you round a corner and are amazed by its beautiful facade. To enter, you must purchase a ticket (5 euros) to the left of the entrance. There are also other combination tickets that let you see additional parts of the cathedral complex. We purchased the 20 euro ticket that included the rooftop ‘Gates of Heaven’, nearby museum with a great view of the cathedral, baptistery and crypt. The price wasn’t cheap, but this let us fully experience everything that the cathedral had to offer.

We visited the Duomo when there were no entrance fees. An amazing iconic place with works from Michelangelo, Donatello, Ghiberti, Bernini. Incredible mosaic marble floor. Gothic architecture and art at its peak.

Italy's most exquisite cathedral! The interior's lofty ceilings, floor-to-ceiling marble mosaics, columns of black and white marble, and elaborate sculptures really left me speechless. There's also the beautiful ceiling in the library. To exchange your pass for a genuine ticket if you bought yours through GetYourGuide, you have to line up on the LEFT side of the cathedral. After that, you can enter the cathedral without having to wait in line.

A not to be missed call if in Sienna. The outside is spectacular and there can be long queues to see the inside but that is even more mind blowing and well worth the wait. Unfortunately, as I found out, you need to queue up twice. Once to get the ticket and then a second time to get in, I went late afternoon and it was not as bad as when I was there earlier in the day.

We recommend that you buy the Porta del Cielo all inclusive pass at the Duomo. Depending on the time of day you may have to line up to purchase the ticket but it was well worth the money. It grants you entrance to the Duomo, Crypt, Battistero, the Library, the Museo dell’Opera and the Porta del Cielo. The ticket is good for three days, one admission to each feature. The views from the Porta del Cielo tour are stunning! This is the only part of the ticket for which you must book a time. WARNING!! This tour and a visit to the Panorama in the Museo dell’Opera Are NOT for those afraid of heights, suffer from claustrophobia or those persons with mobility issues—there are well over 70 steps to climb just to begin these two features and very narrow walkways to navigate. Having said that—do Not miss the stunning artwork and views if you are lucky enough to be in Siena.

This was probably the most beautiful cathedral we saw during our 15 days in Italy. The one in Florence may be bigger, but this one may be even more stunning. We purchased our tickets mid-day, no line, no crowds. So much to see - be sure and look up, down and all directions... every surface is just incredible.

We visited the Duomo today. The ticket office line was well organised and quick. We bought the full ticket including all attractions. This was a little more expensive, but well worth it. The Gate of Heaven visit adds €5 per person, but you get to walk through the roof spaces, looking down into the cathedral and then out onto the edge of the dome. The views are amazing, both inside and out. Other attractions include the Piccolomini Library, the crypt, the baptistery, the museum and the very high walk along the walls of the new cathedral, which only has one wall! Add to this amazing marble floors, stunning ceilings and many beautiful statues, this is a cathedral worthy of your time. We spent four hours seeing everything.

Siena Cathedral (Italian: Duomo di Siena) is a medieval church in Siena, Italy, dedicated from its earliest days as a Roman Catholic Marian church, and now dedicated to the Assumption of Mary. It was the episcopal seat of the Diocese of Siena, and from the 15th century that of the Archdiocese of Siena. It is now the seat of the Archdiocese of Siena-Colle di Val d'Elsa-Montalcino. The cathedral was designed and completed between 1215 and 1263 on the site of an earlier structure. It has the form of a Latin cross with a slightly projecting transept, a dome and a bell tower. The dome rises from a hexagonal base with supporting columns. The dome was completed in 1264. The lantern atop the dome was added by Gian Lorenzo Bernini. The bell tower has six bells, where the oldest one was cast in 1149. The nave is separated from the two aisles by semicircular arches. The exterior and interior are constructed of white and greenish-black marble in alternating stripes, with the addition of red marble on the façade. Black and white are the symbolic colors of Siena, etiologically linked to black and white horses of the legendary city's founders, Senius and Aschius. There are thirty-five statues of prophets and patriarchs grouped around the virgin. The finest Italian artists of that era completed works in the cathedral. These artists were Nicola and Giovanni Pisano, Donatello, Pinturicchio, Lorenzo Ghiberti, and Bernini.

This is the number one attraction of Siena, especially when the marble inlay floor is uncovered. The marble inlay art that covers the entire floor of the church is simply impressive. The floor is uncovered only during some periods of the year. It is highly recommended to check the schedule before planning a trip to Siena. There is a guided tour of the upper part of the cathedral, Porta del Cielo (Gateway to Heaven), which allows a bird's-eye-view of the floor. It is also recommended and requires advance reservation. The Piccolomini Library that is connected to the cathedral is a beautiful hall with a collection of old music scores.