Pont del Diable Roman Aqueduct Hike

How to Complete

4 steps curated by Wine Memories

1. ⛰️ 1

   Walk the Specus — Rome's 2,000-Year-Old Water Channel

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   You are walking inside the same channel that Augustus's engineers built to supply the wine capital of the Roman Empire along the top of the aqueduct — access via the stone staircase at either end of the bridge. Not a replica. Not a reconstruction. The actual cut stone where water flowed from the Francolí River, 15 kilometers away, elevated precisely to 92 meters above sea level — all without GPS, without concrete, without mortar holding a single block. The channel is 2.5 Roman feet wide (74 cm). Take the staircase at the north end of the aqueduct. At the top, stop. Look down: 27 meters (nearly 9 stories). Look along the channel: 217 meters of dry-stacked stone. Every arch is exactly 20 Roman feet (5.9m) wide — archaeologists measured the variation across all 36 arches and found a maximum error of 15cm. In 2,000 years. Touch the stone on the channel floor — this is opus signinum, Roman waterproof concrete made from crushed terracotta. The walls of the channel were still carrying water to the city of Tarragona in the 1700s AD.

   🔄 BACKUP: If the top walk is closed (rare maintenance), walk beneath the lower arches and count them — 11 lower, 25 upper. Stand at the center point and look up through both tiers. The perspective reveals the stepped pier construction: each pier widens by half a Roman foot (15cm) at every level to distribute the load. Engineers 2,000 years before structural calculations figured this out by observation alone.

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2. 📜 2

   Find the Devil's Claw Marks

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   Medieval Catalans could not believe Romans built this structure — no sane human could stack 27 meters of stone without mortar and have it stay up at ground level, along the base of the lower tier arches (specifically the northwestern piers closest to the forested ravine). So the legend emerged: the Devil built it overnight, after a bet with a young woman who wagered her soul. When finished, the Devil demanded the first soul to drink the water. The builders outsmarted him: they sent a cat across first. The Devil got the cat. In his fury, he drove his claws into the stone. You're looking for gouges in the Roman ashlars — marks that are probably natural erosion patterns, but which local storytellers have been pointing to for 700 years. Walk the full length of the northern face at ground level. The ashlars (large cut limestone blocks) were stacked dry — no mortar — and 2,000 years of rain and frost have created natural grooves and fractures. Some look startlingly like finger gouges. The ones locals traditionally point to are near the 4th pier from the left (north end). Ask any other visitor or park staff: 'On escolta que hi ha les marques del diable?' ('I heard there are the Devil's marks?')

   🔄 BACKUP: The UNESCO information panels around the site include both the engineering specifications AND the Devil legend. Even if you can't find the specific stones, the panel gives you everything you need to tell the story properly.

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3. 📜 3

   Decode the Engineering Impossibility

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   This structure was built WITHOUT a single drop of mortar between the main ashlars — held together by gravity, friction, and geometric precision alone using a technique the Romans called 'opus quadratum,' standing directly underneath the central span of the aqueduct in the ravine below. Archaeologists measured every arch diameter across all 36 arches and found a maximum variation of just 15 centimeters. That's less than the width of your hand. Across 217 meters. Built by hand in the 1st century BC. And then: it worked until the 18th century. A Moorish Caliph (Abd al-Rahman III) repaired it in the 10th century because it was STILL WORTH USING. 1,700 years of service. From below the central span, count the upper arches visible from where you stand (25 total). Notice the piers: each one is slightly wider at the base — not for decoration, but because the Romans understood load distribution without calculus. Pliny the Elder, writing in the 1st century AD, named the wines of Tarraco among the finest in the Empire. This aqueduct supplied the city that produced them.

   🔄 BACKUP: The on-site information boards explain the construction techniques in detail. The archaeological journal from UPC (Technical University of Catalonia) has published structural analyses confirming the precision figures — but you don't need the paper. The measurement signs at the site give you the arch count and heights.

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4. 🍷 4

   Taste What Pliny the Elder Called Rome's Best

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   Pliny the Elder — Rome's most prolific natural historian and the world's first known wine critic — wrote that the wines of Tarraco were among the most privileged in the entire Empire at El restaurant de la casa del guarda (the small cafe/restaurant inside the eco-historic park, immediately northwest of the aqueduct). This aqueduct existed to supply that city. The water it carried helped fill the fermentation vessels that produced what Rome considered prestige wine. What you should be drinking: DO Tarragona white (Macabeo or Garnacha Blanca) or red (Garnacha, Cariñena). These are direct descendants, grown on the same limestone soil Pliny's merchants were shipping. Order in Catalan if you can: 'Un vi local, si us plau' ('A local wine, please'). Tell whoever pours it: 'Pliny the Elder wrote that Tarraco made Rome's best wine.' Budget: expect €4–8 per glass at the park cafe. Alternatively: the wine bars in Tarragona's medieval quarter: Espai Vi or El Tamboret, both on Plaça del Fòrum.

   🔄 BACKUP: Any supermarket in Tarragona sells DO Tarragona wines for €5–12 a bottle. Buy one, bring it back to the park (free access, 24 hours). Toast from the forest clearing below the aqueduct at sunset. The park has shaded picnic areas. No permit needed.

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Insider Tips

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  You can actually walk on top of the aqueduct (carefully!)

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  Morning light is best for photography

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  Combine with a winery visit in Alt Camp afterward

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  Bring a picnic and wine to enjoy in the surrounding forest