The Wild Road to Col de Jou in the Pyrenees

Col de Jou is a mountain pass in the Pyrénées-Orientales department of southern France, sitting at 1,125 meters (3,690 feet) above sea level. It's tucked away in the Occitania region, and there's a convenient parking lot right near the summit if you need a breather.

Here's the thing about Route de Mariailles—it's technically paved, but honestly, it looks like it's barely made it past the unpaved stage. This isn't a road for the faint of heart. We're talking seriously narrow, switchback-laden terrain that'll test your nerve and your steering wheel skills. If tight mountain roads make you sweat, you might want to give this one a pass.

Starting from Casteil, you're looking at a 3.7-kilometer (2.3-mile) climb with 323 meters of elevation gain. That works out to an average gradient of about 8.7%—steep enough to feel it in your legs if you're cycling, or in your engine if you're driving. The combination of the narrow road, crappy pavement, and serious incline makes this a proper adventure. It's the kind of drive that's exhilarating once you've conquered it, but definitely not one to tackle on autopilot.