Carnuntum Archaeological Park

The best-preserved Roman city in Central Europe. Carnuntum was the capital of Pannonia Superior, home to the XIV Legion. Reconstructed buildings, amphitheatre, and the Palace Quarter show how 50,000 people lived — and drank — on the Danube frontier.

What to do there

5 things to do

1. 1 Stand Where Three Emperors Failed to Save Rome History · Free

   On November 11, 308 AD, Diocletian, Maximian, and Galerius met here in the civilian city of Carnuntum — the last time three Roman emperors occupied the same room. They had one task: stabilize the empire. None of their decisions held. Within twenty years, Constantine was sole ruler of the Roman world. This was the hinge point. The place where the Roman empire entered its final chapter.

   Where: The civilian town of Carnuntum, Petronell-Carnuntum — the open archaeological zone freely accessible without a ticket. Walk to the center of the civilian city ruins, GPS 48.1167, 16.8667. The town's forum area is signposted from the main road.

   What: You are standing in the city where three emperors — Diocletian, Maximian, and Galerius — held the Conference of Carnuntum on November 11, 308 AD. Diocletian had already voluntarily retired (the only Roman emperor who ever did). Galerius dragged him back to this meeting. They appointed a new western Augustus, demoted Constantine to junior caesar, ordered Maximian to stand down permanently. Constantine refused the demotion and declared himself Augustus anyway. Maximian launched another conspiracy and was dead within two years. The whole arrangement unraveled. And they held this meeting 'under the auspices of Mithras' — dedicating it to the Unconquered Sun God — six years before Constantine legalized Christianity. This field saw the last gasp of the old Roman religious and political order.

   How: Free access, no ticket needed, open year-round. Take the ÖBB train from Wien Mitte station to Petronell-Carnuntum (46 minutes, hourly service, approx. €9). From Petronell train station (400m from the site), follow signs to the archaeological park. The civilian city grounds are open and walkable at no charge. On weekends from March to November, a free shuttle bus connects the train station to the Roman Quarter.

   Backup: If the weather is bad and you want context before walking, start at the Museum Carnuntinum in Bad Deutsch-Altenburg (5km east by car or shuttle) — it holds the fullest collection of Carnuntum artifacts and gives the story before you walk the ground.

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2. 2 Touch the Building Where Marcus Aurelius Wrote 'This in Carnuntum' History · Price: moderate

   Marcus Aurelius spent three years at Carnuntum — 172 to 175 AD — commanding the First Marcomannic War while managing a plague that had already killed millions across the empire. Every evening, in his camp tent, he wrote philosophy to himself. Not for publication. Not for posterity. To stay sane. The result was the Meditations. Book II ends with two words: 'This in Carnuntum.' He was fifty years old, the most powerful man in the world, writing that life is 'warfare and a sojourn in a foreign land' — while doing exactly both.

   Where: The Roman Quarter (Römerstadt Carnuntum), main entrance on Hauptstrasse, Petronell-Carnuntum, GPS 48.1167, 16.8667. This is the ticketed section of the park.

   What: Inside the reconstructed urban villa in the Roman Quarter, you are in a building that sits on the original foundations of a 4th-century Carnuntum house — the same civilian city Marcus Aurelius walked through during his three-year command. The reconstructions are archaeologically exact: every wall painting, every floor tile pattern, every kitchen implement was cross-referenced against excavation finds. No museum cases. No explanatory labels inside. Fresh fruit in the kitchen, a cloak on a workbench, water running through the hypocaust bath. It looks as if the family just left that morning. This is the only place in the Roman world where you can walk into a fully reconstructed, furnished Roman house without a glass barrier between you and 300-year-old wall paintings.

   How: Buy the combined day ticket at the main entrance — approx. €13–16 for adults, covering both the Roman Quarter and Museum Carnuntinum. Open daily mid-March to mid-November, 9am–5pm. Budget 90 minutes for the Roman Quarter alone. The bathhouse with functional hypocaust heating is the showstopper — ask a guide to explain how the underfloor system worked. The small house with the original floor mosaic (not a replica — the actual Roman mosaic, in situ) is through the back courtyard.

   Backup: If visiting out of season (Nov–March), the Museum Carnuntinum in Bad Deutsch-Altenburg is open year-round (check carnuntum.at for winter hours) and contains all the key Carnuntum artifacts including Marcus Aurelius-era inscriptions and military equipment.

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3. 3 Find the God Born from Rock Who Demanded Bread and Wine History · Price: moderate

   Five Mithraic sanctuaries have been excavated at Carnuntum — more than anywhere else north of the Alps. The first Mithraic dedication on the Danube frontier was made here in 71 AD by soldiers returning from the Jerusalem campaign. Mithraism was the secret religion of the Roman army: seven grades of initiation, communal sacred meals of bread and wine, an inner circle who called themselves 'those united by the handshake.' The Conference of 308 AD was dedicated to Mithras — three emperors invoking the Unconquered Sun God as they tried to hold together a fracturing empire. Six years later, Constantine legalized Christianity. Mithras lost. But the sacred meal survived.

   Where: Museum Carnuntinum, Badgasse 42, 2405 Bad Deutsch-Altenburg — 5km east of the Roman Quarter by car or shuttle. GPS 48.1600, 16.9100. This is Austria's largest Roman museum.

   What: On the ground floor, the Carnuntum Mithraeum exhibit holds the actual tauroctony relief — the central Mithraic cult image showing Mithras slaying the cosmic bull. This specific image came from the largest mithraeum excavated at Carnuntum (discovered 1894 at Lange Gasse, Petronell). The exhibit includes a reconstructed Mithraic altar with original colored lighting to show how the cult objects appeared during initiation rituals. The altars were set up by legion officers, priests, and slaves — Mithraism was one of the few cults that crossed rank and class. Six altars from Mithraeum I alone were dedicated by a cross-section of Carnuntum society.

   How: Ticket included in the combined day ticket (approx. €13–16). Open daily mid-March to mid-November, 9am–5pm. The Mithraeum exhibit is on the ground floor — ask staff to direct you. The museum holds over 2 million preserved pieces; budget at least 60–90 minutes. The special 2025/2026 exhibition '1700 Years of the Council of Nicaea' runs alongside the permanent collection and connects the Carnuntum story directly to Christianity's rise.

   Backup: The Carnuntum website (carnuntum.at) has a detailed digital exhibit on Mithras if you want to read the background before your visit. The magazine article 'Mithras in Carnuntum — A cult between military and mystery' is freely available online.

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4. 4 Count the 12,000 Square Metres Still Sleeping Underground Adventure · Free

   In 2011, archaeologists pointed ground-penetrating radar at a field next to Carnuntum's civilian amphitheatre and found something nobody expected: the most complete gladiator school ever discovered outside Rome and Pompeii. 12,000 square metres. Forty to sixty gladiators. Heated dormitories. A training arena 19 metres across. An assembly hall. Baths. Said to rival the Ludus Magnus — the school that trained men for the Colosseum in Rome. Almost all of it is still underground. What you see above ground is a wooden reconstruction of the training arena, the shape of the place, the scale of it. The rest waits.

   Where: The civilian amphitheatre site, Petronell-Carnuntum, approx. GPS 48.1133, 16.8614 — in the open archaeological zone south of the Roman Quarter, freely accessible without a ticket.

   What: The gladiator school is located directly adjacent to the civilian amphitheatre (Amphitheatre II — the one that held 13,000 spectators). A wooden reconstruction of the training arena marks the underground footprint. The amphitheatre itself is now a grass-covered earthwork ring, colonized by European ground squirrels, with slender trees outlining its elliptical shape — 68m long, 52m wide. At the military amphitheatre (Amphitheatre I, separate site 700m north, also free), you can still see the mouth of the tunnel the gladiators emerged from into the arena.

   How: Both amphitheatres are freely accessible without a ticket, open year-round. From the Roman Quarter main entrance, walk south along the signposted archaeological route to reach the civilian amphitheatre in about 10 minutes on foot. The small exhibition building at the military amphitheatre has an interactive city plan and gladiator displays — worth 20 minutes. The Smithsonian wrote extensively about the 2011 discovery: search 'Carnuntum gladiator school Smithsonian' for the full story before you visit.

   Backup: If the weather makes walking the open sites unpleasant, the Museum Carnuntinum in Bad Deutsch-Altenburg has a dedicated gladiator exhibit with recovered equipment and the story of the 2011 radar discovery.

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5. 5 Watch the Last Thing Left Standing After 1,700 Years Adventure · Free

   When the Huns swept through Pannonia in 433 AD and the Roman world collapsed, 50,000 people left Carnuntum. The roads emptied. The forum fell silent. The great city returned to fields. And one thing kept standing: a four-arched monument built for Emperor Constantius II, son of Constantine, commemorating victories over barbarian incursions across the Danube. Three of its four arches collapsed over the centuries. One arch remained. Medieval farmers, finding it alone in a field with no context whatsoever, decided it must be a pagan giant's tomb and called it the Heidentor — the Heathens' Gate. It is still 13 meters tall. It is still standing alone in an open field. It is the largest surviving Roman triumphal monument in Austria.

   Where: Heidentor (Heathen's Gate), approximately 1km south of the civilian town center, Petronell-Carnuntum. GPS 48.1040, 16.8543. Follow the footpath south from the Roman Quarter or drive along the B9 road and park at the marked lay-by.

   What: Built 354–361 AD under Constantius II as a quadrifrons — four pillars, four portals, sides of 15 meters, a monument meant to be seen from every approach road to Carnuntum. Of the four arches, one arm survives. It stands 13+ meters tall in an open agricultural field with no fence, no admission charge, no tourist infrastructure. You can walk right up to it and put your hand on stone that Constantius II ordered cut and placed 1,670 years ago. The Carnuntum website uses overlaid AR images to show what the full structure once looked like — download the Carnuntum app before your visit to use the augmented reality view on site.

   How: Freely accessible, no ticket, no opening hours — 24 hours year-round. From the Roman Quarter, it is a 15-minute walk south along a marked archaeological trail. At golden hour the single surviving arch catches the light from the west and casts a long shadow across the field. This is the moment this monument was built for — arrival from the road, the arch framed against the sky, the Danube plain stretching behind it. Plan your timing accordingly.

   Backup: The Heidentor is visible from the B9 road even if you don't walk the path — but parking and approaching on foot is the only way to understand the scale.

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