Historic part of the Cathedral that’s separate entry. You can visit it on the Brunelleschi Pass and no reservation is needed. It’s the underground portion of the church and it contains some crypts/exhibits. It took us about 30 minutes to go around. You scan your ticket at the door after a security check (similar to all of the other Cathedral attractions). It took about 30 minutes to also wait in line, so I would budget about an hour for this experience.

Totally worth a visit to check the history of the Cathedral. Not so crowded. The entrance is on the south part of the cathedral (next to the bell tower) and you can also check the cathedral inside (almost like a skip the line ticket for cathedral interior because not so many people visit the Crypt)

To enter the Crypt of Santa Reparata, you should buy a ticket at the office across from the door into the cathedral that is located just opposite from the Campanile. While the line is shorter than the line to get into the cathedral for free, it's still a wait if you get to the Duomo after mid-morning. The crypt though is very cool with so much mosaic work on the floors that they are preserving with floating walkways. I think that the crypt and the museum are the best elements of the Duomo di Firenze

The crypt is underneath the cathedral. In order to enter the crypt you need to queue to enter the cathedral. The queue for the cathedral can be long and may take about 30 minutes. The crypt is part of a Brunelleschi Pass which costs €30. The pass can be purchased online. It contains access to the doom, cathedral, Baptistery of San Giovanni, Giotto's Bell Tower, Opera del Duomo Museum and the ancient crypt of Santa Reparata. When entering the cathedral you will go through a xray machine. The crypt is open from 10:00 to 16:30pm. Saturday 10:00-16:45pm. The crypt shows the old church and a number of Mosaic floors. There are a number of information boards in English. The mosaic floors are intact and detail.

Incredibly interesting ruins of historic churches and cathedrals underneath the extant Florence Cathedral. Some incredible mosaics are visible! The ruins are well preserved and the oldest date back to Roman times, the newest are Romanesque (13th Century). The changes (4+ evolutions of the church) are well explained through maps models. Once you've been around you can clearly differentiate the ages of the church, and visualise it in the space. Well worth a visit, this was a highlight of our trip. It was unexpected as it doesn't seem well advertised!

Small space, if there are 1 or 2 groups in there with you then it can be very jam packed. it was interesting, would recommend to visit after the cathedral and see some of the historic remains.

The Roman mosaics are 1500-1600 years old and are really fantastic. The crypt gives you a great feel for the original Roman church that was on the site before the Duomo was built. Best part of the visit inside the Duomo for us.

Required to buy tickets in advance. Very cool archeological site with numerous features dating back to pre-Roman times. Mosaics line the floor and stone juts from the walls in this look into the past. The security is pretty tight but do not let your guard down in this place. There is a human skull hidden inside. Overall, I would say if you purchased a ticket for here, it is worth the price of admission as well as the other attractions.

Great view of the original church remains as well the changes of the architecture throughout the ages, including building material changes (stones, vs bricks, vs mosaics)

Fascinating. Just so interesting to see the depths of this incredible building to just grasp the historical intrecacies of the past leading to the future and the present.

When I used to dig holes underground as a kid, my old man would explode with rage - I can see his knarly old face right now explaining how we'd be crushed to death if it collapsed. I was so affected by this that I remember refusing to go into a old mine shaft as a teenager in case it fell on my head and crushed me to death. I'm not so chicken-licken now and this hapless fowl almost craves below ground experiences, so confident that the acorn isn't actually a piece of the nave above me about to give way. You should ignore the reviews that complain about how they've covered stuff up so you can't see it or there's no room you should try the roman baths in Bath in the UK if think it's tight in here. I do agree that group visits are a bit silly in such small spaces and it's not cool at all down there - in the summer a sweaty tourist can kick out over a 1000 watts of heat energy and with the amount of unregulated entry going on, there was close to a 100 people in here today (in other words, a lot of warming going on). The poor old air con was creaking and I hate to think how much vapour these walls are sucking up. There are moisture probes/detectors in some of artifacts' display cabinets but if they keep this up it'll go the way of the Valley of the Kings I'm telling you now. By far the most interesting thing though about the place though was not the mosaics (much better and more complete in Rome, Pompey, Herculaneum, etc.) but the saleable crypt merchandise. Banksy was accused of creating a hoax when he directed exit through the gift shop. It certainly doesn't sit straight with most Roman Catholics that you pay to enter in the first place - exiting through the gift shop might make some believe this isn't a site worthy of religious assignation at all.

This place lies underground beneath the cathedral of Firenze… and shows the Rich history of the church that stood before the current church that stands now.. u have to book tickets in advance to enter

Really interesting excavation and very presentation of v the predecessors to the current cathedral. Worth the combined ticket price.

Beautiful Church, such a work of art, but why have to pay to go into the Church? This was such a horrible idea to make a person to pay to go into a Catholic Church. The Catholic Church is Universal and all should be welcomed into a Church. No one should be deprived of from going into a Church and adoring the Eucharist because they don’t have $10 spot on them. So many people were discouraged and didn’t go into the Church, including us, because we didn’t want to spend the money to go in. Because of this they weren’t able to get the chance to grasp some of the beauty of God or at least question more on the topic of God and how beautiful it is. I respect the idea of coercing people out of a Church if they disrespect it, but do not coerce others to pay to go in, when Catholics and others built the Church for it to be a place of worship for all that want to participate in the Mass. I would gladly have made a donation to the Church, but because it felt so forced I almost did not want to make a offertory to the Church. People are going to think that the Catholic Church is trying to get any buck from them, which isn’t true at all. My final note is why devote your entire life or so much of your life to God, but then not listen or follow Him lack luster. My point is people should all be welcomed into the Church free of charge. Jesus drove out the money changers, so don’t become one.