Aquileia is one of those places most visitors to the region never hear about — yet it was once among the ten largest cities in the Roman Empire, home to roughly a hundred thousand people. Today the population is around three thousand, but the ancient city lives on in its excavations, forum, and above all a basilica with a fourth-century mosaic floor.

From Trieste it's about forty minutes away; from Koper, just over an hour.

The Basilica and Its Mosaics

The basilica's mosaic floor covers more than seven hundred and sixty square metres, making it the largest early Christian mosaic floor in Western Europe. Laid in the early fourth century, it was later buried beneath a subsequent floor and only rediscovered in the early twentieth century — which is exactly why it has survived in such remarkable condition.

The subjects are unusual for a church: fish, birds, fishing scenes, allegorical figures. Christian iconography had not yet solidified, and that is precisely what makes this monument so precious — it captures the transitional moment between antiquity and Christianity.

Glass walkways above the floor let visitors take it all in without ever touching the mosaic. You can also descend separately into the excavation crypt, where fragments of even earlier structures are on display.

The bell tower stands seventy metres tall; climbing it rewards you with sweeping views of the lagoon and, on a clear day, the Alps.

The Archaeological Zone

Entry to the excavations is free. You'll find a forum with standing columns, a stretch of the Roman port on the old Natisone River, remains of residential quarters, and a mausoleum. The National Archaeological Museum nearby holds glassware, amber, and sculpture unearthed on site.

The entire complex has been a UNESCO World Heritage Site since 1998.

Grado

Fifteen minutes from Aquileia lies the island of Grado, connected to the mainland by a causeway. It's the oldest resort on the northern Adriatic — the Austro-Hungarian elite came here to holiday, and the town's character still reflects that era.

What's here: a south-facing sandy beach, a historic old town with the sixth-century Basilica of Sant'Eufemia, and a lagoon dotted with traditional fishermen's huts called casoni, reachable by boat.

Grado is perfect for rounding off the afternoon after Aquileia: ancient history first, then the sea.

Practical

Tickets. Entry to the basilica is paid; a combined ticket covers the crypt and bell tower. The excavations are free.

Time. Aquileia takes two to three hours. Add Grado and you have a full day.

When to visit. Year-round: the basilica is open outside the season, and in summer the coast adds swimming to the mix.

Getting There. By car or with a transferPublic transport from Slovenia is inconvenient and requires several transfers.

FAQ

What is Aquileia known for?

For its basilica's early-fourth-century mosaic floor, spanning more than seven hundred square metres — the largest early Christian mosaic floor in Western Europe. The entire archaeological complex is a UNESCO World Heritage Site.

How long is the drive from Trieste to Aquileia?

About forty minutes by car. From Koper it's roughly just over an hour; the road passes through Trieste on Italian territory.

What is there to do in Grado?

Swim on the sandy beach, wander the historic centre with its sixth-century basilica, and take a boat trip into the lagoon to see the traditional fishermen's huts known as casoni. Grado pairs perfectly with Aquileia as a single day trip.