Milan Cathedral Archaeological Area- Timeline, Medieval Finds, and Visitors’ Information

Beneath the main cathedral lies the Duomo Di Milano archeological area. This place preserves the cathedral’s history dating back almost 600 years and offers visitors a chance to explore its underground remains. Accessible from its interior, this underground archeological area is one of the major highlights of the Duomo Complex.

It houses the remains of some of the city’s earliest Christian structures, ancient basilicas, an early Christian baptistery, original stone walls, excavated foundations, mosaics, and Roman and medieval artifacts. While exploring this site, visitors get a glimpse of the rich medieval Christian and architectural history of Milan back then. 

In this article, we will learn about what to see in the Milan Cathedral archaeological area​, its historical importance, key events that shaped its history, and the best time to visit this area.

Historical Importance of the Milan Cathedral Archaeological Area 

The history of the Duomo Archaeological Area in Milan dates back to the 4th century. During that time, this area served as the center of early Christian worship in Milan and formed the city’s Episcopal Complex. This complex included three major sites: the Baptistery of San Giovanni alle Fonti, the Basilica di Santa Tecla (Summer Basilica), and the Basilica di Santa Maria Maggiore (Winter Basilica). 

Both basilicas had different purposes. Basilica di Santa Tecla was the larger church and was used during the summer months, when its spacious interior could accommodate large religious gatherings. 

The Basilica di Santa Maria Maggiore was known as the Winter Basilica (Basilica Jemalis) because it was used for worship during Milan’s colder months. These three buildings played a very important role in Milan’s religious life for hundreds of years.

In AD 387, the Baptistery of San Giovanni alle Fonti became one of the most significant religious sites in Christian history because St. Augustine was baptized here by St. Ambrose, the Bishop of Milan. Basilica di Santa Tecla was the city’s main cathedral for centuries and hosted major religious ceremonies and episcopal celebrations. On the other hand, Basilica di Santa Maria Maggiore was closely associated with daily worship and seasonal liturgies. 

The construction of Duomo di Milano began in 1386, and this led to the demolition of the ancient Episcopal Complex. Today, the remains of these three places are preserved below the cathedral in the archeological area.

Key Historical Events of the Milan Cathedral Archeological Area

Year	Event
4th Century CE	The first Christian churches and Baptistery of San Giovanni alle Fonti were established.
AD 387	St. Augustine was baptized by St. Ambrose.
9th Century CE	Basilica di Santa Maria Maggiore was rebuilt and served as Milan’s Winter Basilica.
1386	Demolition of the complex, and construction of Duomo di Milano began.
1960’s	The Milan Cathedral archeological area was opened to the public.

Walking Through The Archaeological Area – What to see?

With a Milan Duomo archeological area ticket, visitors can access the underground area with a 27-step staircase from the cathedral interiors. As you walk through the preserved site, you’ll come across the remains of what Milan has been preserving for centuries.

Baptistery of San Giovanni alle Fonti

In the Baptistery of San Giovanni alle Fonti, visitors can still see the remains of its octagonal baptismal font, where full-immersion baptisms were once performed. The baptistery originally featured 8 marble columns surrounding the octagonal space.

You’ll walk along the preserved stone basin, sections of the original marble flooring that have a black-and-white geometric mosaic floor, and the outline of the baptistery, which gives a clear view of the original layout. St. Augustine was baptised by St. Ambrose in AD 387 here. 

Basilica di Santa Tecla (Summer Basilica)

At Basilica di Santa Tecla, you will walk through the site and see portions of its stone foundations, brick walls, and structural remains. Visitors can see the apse; however, much of it is in ruins today. 

Basilica of Santa Maria Maggiore (Winter Basilica)

The Basilica di Santa Maria Maggiore is represented by its surviving foundations and sections of ancient masonry preserved beneath the cathedral. Less of the structure remains visible today 

Roman & Medieval Archaeological Finds 

As you walk through the archeological area, you’ll spot stone fragments, carved architectural elements, ancient brickwork, burial remains, and inscriptions on your way. 

Visitors will also see the burial remains and traces of a three-apse hall, believed to have been used for funerary ceremonies during the early Christian period. These medieval archaeological finds depict the religious life that shaped the site over the centuries.  

Crypt

The crypt is located exactly beneath the high altar in the main cathedral. This place should definitely be on your list of what to see in Milan Cathedral, as it houses the relics of St. Charles Borromeo and a rock crystal shrine. Its octagonal layout is quite impressive as well.

Shrine of Saint Charles Borromeo

Visitors will see the relics of St. Charles Borromeo, the Archbishop of Milan, who played a key role in reforming this church. Pilgrims from across the world visit the crypt to pay their respects here. The main reason that the crypt has such a high religious significance is because of his preserved body.

Exactly at the centre of the crypt, you’ll see a rock crystal shrine, where the body of St. Charles Borromeo is preserved. It is a silver coffin enclosed by crystal panels, and it is where the saint rests. This shrine is kept in a small, octagonal chamber, which is surrounded by pretty silver decorations, marble details, and an altar to honour Milan’s patron saint. 

Chapel & Historic Artifacts 

There is a circular chapel supported by elegant marble columns beside the crypt. Visitors can see the detailed stucco decorations on the ceiling, along with the geometric marble Tuscan patterns on the floor. You’ll also see sacred relics and circular wooden choir stalls around.

Visitors Information About Milan Cathedral Archeological Area

Besides knowing about what to see at the Milan Cathedral archeological area, it is also important to know about its entrance, tour duration, and the best time to visit. Here’s a brief overview of all. 

Location & Entrance

Milan Cathedral’s archeological area is located almost 3.8 meters below the main cathedral.  Visitors can access the Duomo archeological area entrance from inside the main cathedral premises. A 27-step staircase is located near the left aisle or the main entrance that leads down. Entry is only permitted with a Duomo ticket that includes access to the archeological area. Check out Milan Cathedral Entrances to know the access points closest to Archeological area.

Opening Hours & Tour Duration

Milan Cathedral archaeological area​’s opening hours are similar to those of the main cathedral, from 8 AM to 7 PM. The last admission is around 6 PM, and visitors are not permitted to enter beyond this time.

Most visitors spend 30 minutes exploring the underground remains. If you take time to read the information panels or join a guided tour, your visit may last up to 45 minutes.

Best Time To Visit

The best time to visit the archeological area is during the early morning hours, around 9 AM. This is when the crowds are the least, and visitors are busy exploring the main cathedral or the rooftop terraces. 

If you miss the morning hours, another good time is after 4:00 PM. During these hours, small group tours have already left the Duomo Complex, and a majority of the cathedral crowd moves to the rooftop terraces for sunset views, making the underground archeological area quieter.  

To plan your visit at the best time of day, read our guide to Milan Cathedral opening hours.

Tips to know before visiting the Milan Cathedral Archeological Area

• Follow the Milan Cathedral dress code and avoid wearing skirts, shorts, and tank tops. Shoulders and knees have to be kept covered as the area is accessed from inside the cathedral.
• Wear comfortable, non-slippery, and closed-toe shoes as you’ll walk through the underground walkways that include ancient stone surfaces and steps.
• Avoid flash photography in the main cathedral and the archeological area. Normal photography can be practiced.
• Drones, tripods, selfie sticks, and cameras are not permitted in the cathedral, so avoid carrying them.
• Check the Duomo di Milano archeological area map before your visit to understand the route through the underground remains.
• Opt for one of the Milan Cathedral archeological area tours because you’ll get valuable insights into the history of the Baptistery of San Giovanni alle Fonti and the Basilica di Santa Tecla.
• We recommend you visit the archaeological area first and then explore the main cathedral. Exploring the underground site first gives you a better understanding of the Duomo’s origins before seeing the cathedral.

To make the most of your time exploring the Archaeological Area beneath the Duomo, check out our Milan Cathedral visiting tips for practical advice on the best times to visit, how to avoid the busiest hours, and how to plan the rest of your cathedral experience.

FAQs About Milan Cathedral Archeological Area