San Boldo Pass is a military road with 18 hairpin turns and 5 tunnels
Italy, europe
1 km
712 m
hard
Year-round
# 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.
Where is it?
San Boldo Pass is a military road with 18 hairpin turns and 5 tunnels is located in Italy (europe). Coordinates: 46.0050, 12.1697
Road Details
- Country
- Italy
- Continent
- europe
- Length
- 1 km
- Max Elevation
- 712 m
- Difficulty
- hard
- Coordinates
- 46.0050, 12.1697
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