
A Grueling Unpaved Road to the Summit of Colla d’Onzo
Italy, europe
7.9 km
843 m
extreme
Year-round
# Colla d'Onzo: A Thrilling Mountain Challenge
Ready for one of Italy's most intense driving experiences? The Colla d'Onzo mountain pass sits at 843m (2,765ft) in Liguria's Province of Savona—and it absolutely lives up to its reputation as a seriously demanding ride.
This 7.9 km (4.90 miles) stretch connecting Nasino to Capitolo-Costa runs straight up the mountainside with a relentless 10.24% average gradient. But here's the kicker: some sections kick up to a brutal 20%, making this pass no joke for unprepared drivers.
What makes it truly gnarly? The road is absurdly narrow—two medium-sized cars literally can't pass each other. You'd better be comfortable with tight reversing maneuvers, because you'll likely need them. Throw in mixed paved and unpaved sections, and conditions that get sketchy after rain, and you've got yourself a serious challenge.
Low-clearance vehicles? Skip this one entirely. The steep, winding terrain demands respect and solid driving skills. But if you're up for it, you'll experience one of northern Italy's most spectacular and unforgiving alpine routes—the kind of drive that gets your heart pumping and leaves you with an unforgettable story.
Where is it?
A Grueling Unpaved Road to the Summit of Colla d’Onzo is located in Italy (europe). Coordinates: 41.5212, 10.6083
Road Details
- Country
- Italy
- Continent
- europe
- Length
- 7.9 km
- Max Elevation
- 843 m
- Difficulty
- extreme
- Coordinates
- 41.5212, 10.6083
Related Roads in europe
hardA curvy paved road to Lago della Sella
🇨🇭 Switzerland
# Lago della Sella: A Scenic Alpine Drive Nestled in Switzerland's Ticino canton, Lago della Sella sits pretty at a breathtaking 2,297 meters (7,536 feet) above sea level. Getting there? It's an adventure in itself. The asphalt road—affectionately known locally as Lago della Selia—winds its way up from Passo del San Gottardo with character and charm. Built back in 1947, this narrow ribbon of pavement hugs the shoreline and offers some seriously stunning views. Fair warning though: it's tight in places (sometimes barely wide enough for two cars to pass), and more than a few stretches lack guardrails, with water lapping right alongside the road. Snow can close it down anytime during winter, so timing is everything. The real vibe here? It's walker-friendly and refreshingly quiet—you'll hardly spot another vehicle, which somehow makes it feel even more special when you do. Once you reach the lake, there's a gravel road extension (marked as E) that climbs even higher via a series of hairpin turns, reaching 2,525 meters if you're feeling extra adventurous. This is the kind of drive that sticks with you—intimate, dramatic, and utterly Swiss Alpine.
extremeWhere is Port de Cabús?
🌍 Andorra
Okay, buckle up, adventure awaits at Port de Cabús! Straddling the border between Andorra and Spain, this epic mountain pass climbs to a whopping 2,308 meters (that's 7,572 feet!). You'll find it nestled in the Pyrenees, linking La Massana in Andorra with the Pallars Sobirà region of Spain. What makes this spot so cool? Well, aside from bragging rights for conquering one of the highest roads around, the summit boasts a huge parking area and some quirky art – keep an eye out for "The Storm," a giant teacup sculpture! No need to worry about border patrol here. Heads up, this was once a sneaky smuggling route! Planning your trip? Aim for June to October. Winter brings heavy snow, making the road impassable. From La Massana, Andorra, it's a 17.8 km (11 miles) paved climb (CG4). Don't underestimate it – some sections are seriously steep, hitting almost 12%! The last stretch is paved but without barriers, so take it slow. The Spanish side (Carretera de Tor) is a different beast entirely: 7.5 km (4.66 miles) of unpaved, rugged terrain. A 4x4 is your best friend here, especially with those 9 hairpin turns. The gradient is equally intense, maxing out around 12%. Word to the wise: avoid it after storms. Remember, this is a protected natural area, so convoys are limited to 4 vehicles. The views? Absolutely stunning. The challenge? Totally worth it. Get ready for an unforgettable ride!
extremeHow to get by car to Imbros Gorge in Crete?
🇬🇷 Greece
# Faragi Imbrou: A Thrilling Canyon Drive in Crete If you're hunting for one of Crete's most jaw-dropping road experiences, head to the southwest coast and prepare yourself for Faragi Imbrou—also known as Gola Di Imbros. This isn't just any gorge; it's one of the deepest and narrowest canyons the island has to offer, and the drive through it is absolutely unforgettable. The 16.8 km route stretches north-south between Askifou and Komitades, winding through the dramatic White Mountains range. What makes this journey so intense? Picture towering limestone cliffs so close together that in some spots you're driving through passages just 1.6 meters wide—that's less than 5 feet! The scenery is stunning: wildflowers dot the landscape, and you might spot sure-footed goats casually navigating the rocky terrain like they own the place. Now, let's talk about the drive itself. Though the road is fully paved (which is honestly a relief), it's got serious personality. You'll tackle 18 hairpin turns, navigate three tunnels, and handle gradient sections up to 10%—the road basically does everything except loop-de-loop. It twists and turns relentlessly, climbing and descending as it hugs the coastline. Beyond the adrenaline rush, there's real history here. During World War II, Allied soldiers used this very gorge as a critical escape route to reach the sea. There's also a fascinating local legend about two brothers banished from Imbros, Turkey, who settled in the nearby village. One heads-up: this road can close unexpectedly due to landslides, so check conditions before you go. But if you time it right, Faragi Imbrou delivers one of Greece's most spectacular driving experiences.
hardSan Boldo Pass is a military road with 18 hairpin turns and 5 tunnels
🇮🇹 Italy
# Passo di San Boldo: Italy's Wild Mountain Marvel Nestled in northeastern Italy's Veneto region at the southern edge of the Alps, Passo di San Boldo is a jaw-dropping mountain pass that sits 712m above sea level. This isn't just any scenic drive—it's a white-knuckle adventure that'll have you gripping the steering wheel like your life depends on it. The star of the show is the 11.6km stretch of Strada Provinciale 635 that connects Tovena to Sant'Antonio Tortal. What makes this road absolutely legendary? Eighteen hairpin turns, six tunnels, and some seriously insane engineering. The real showstopper is a mind-bending 1km section packed with five tunnels carved directly into the rock face, eight numbered switchbacks, and six bridges that'll make your heart skip a beat. Here's where it gets wild: this road has a genuinely epic backstory. Built in just four months (February to June 1918) during World War I, it earned the nickname "Road of 100 Days." An incredible 1,400 people—soldiers, prisoners of war, and local residents—worked around the clock to create this strategic supply route for the Battle of Piave. Engineer Giuseppe Carpenè directed the project, which originally started in 1914. The numbers tell you everything you need to know about the challenge: despite the brutal terrain, the grade was limited to 12% for heavy military vehicles. Yet some of those switchback ramps? They hit a jaw-dropping 37% gradient. Today, one-way traffic controlled by traffic lights keeps things manageable, with a 30 km/h speed limit and a 3.2m height restriction (buses kept getting stuck in the tunnels). Fun fact: the pass is named after San Boldo, a Spanish hermit who once lived in these mountains and eventually became a saint. Pretty cool naming story for one seriously intense drive.