Discover the extraordinary Roman engineering feat that drained Lake Fucino through miles of hand-carved tunnels in the Abruzzo hills.
The Tunnels of Claudius represent one of the most ambitious civil engineering projects of the ancient world. Commissioned by Emperor Claudius in the first century AD, the system was designed to drain the Fucine Lake, once the largest inland body of water in central Italy. Workers excavated approximately 5.6 kilometers of tunnel through solid limestone beneath Mount Salviano, connecting the lake basin to the Liri River. The project required eleven years and thousands of laborers, many of them prisoners, and stands as testimony to Roman hydraulic skill.
Visitors can explore preserved sections of the emissary, including the main tunnel entrance near the former lake bed and the impressive outlet structure. The sheer scale of the passages, with their regular cross-sections and occasional vertical shafts for ventilation and spoil removal, reveals the precision of Roman surveying. Interpretive panels explain the construction techniques, including the use of fire-setting to fracture rock and the challenges of maintaining consistent gradients over long distances. Nearby, the flat Fucino plain offers a striking contrast to the surrounding mountains, illustrating the transformation the tunnels achieved.
The site lies just outside Avezzano in the Abruzzo region. Travelers arriving by train can disembark at Avezzano station and continue by local bus or taxi to the Fucino basin. Motorists from Rome take the A25 motorway and exit toward Avezzano, following signs for the Fucine plain. The coordinates place the primary access point on the western edge of the former lake bed, within easy reach of the town.
Spring and autumn provide the most comfortable conditions for walking the exposed sections of the emissary. Summer heat can intensify inside the tunnels, while winter rains may make paths slippery. The mild climate of these seasons also allows visitors to combine the site with hikes in the nearby Sirente-Velino Regional Park.
The surrounding area offers additional Roman and natural sites. The town of Avezzano features remnants of its medieval castle and a lively market. Short drives lead to the shores of the modern Fucino agricultural plain and the dramatic limestone ridges of the Apennines. Further afield, the Abruzzo National Park provides opportunities to see wildlife and mountain scenery that once framed the ancient lake.
Most visitors spend two to three hours exploring the accessible tunnel sections and surrounding plain.
Yes, but supervise younger children closely near the tunnel entrances and uneven ground.
Only limited sections are open to the public; the full 5.6 km route remains closed for safety and preservation reasons.
Basic facilities are available in nearby Avezzano; plan to bring water and snacks for the site itself.
Comfortable shoes, water, a light jacket, and a flashlight are recommended for exploring the tunnels.
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