Cuesta del Clavillo

Okay, adventure seekers, buckle up for the Cuesta del Clavillo in Tucumán Province, Argentina! This isn't just a road; it's a wild ride carved into the mountains within the Parque Nacional Campo de los Alisos. Think Ruta Nacional 65—but forget the smooth tarmac. We're talking a narrow, dirt track that clings impossibly to the cliffside, snaking up via 14 crazy-tight hairpin turns.

This 5.5km stretch throws you from 1,625m to 1,867m above sea level, packing in a 242-meter climb with some sections hitting a serious 10% gradient. Translation: it's steep! The gravel surface can be loose, especially on the edges, so stay sharp.

Heads up: this route isn't for the faint of heart! Expect heavy traffic, year-round rain and fog. Landslides, anyone? Visibility can drop to zero in an instant. And those views? Stunning, but remember that in many spots, it's a sheer drop of hundreds of meters with zero guardrails. If you’re prone to motion sickness, maybe skip that extra empanada before you go!

Oh, and be prepared. This track gets seriously muddy and slippery after rain, so even a 4x4 might struggle. During and after a storm, it can be totally impassable. But, for the skilled and the brave, Cuesta del Clavillo offers an unforgettable, adrenaline-pumping experience.