Running from the US/Mexico border at Tijuana, down the Baja California peninsula to Cabo San Lucas, Mexico’s Highway 1 spans 1,063 miles, and is peppered with blind corners, few road signs, and little to no guard rails. Drivers tend to speed down this two-lane road, meaning that you can easily encounter an irresponsible driver flying round a corner on your side of the road. 3. Patiopoulo-Perdikaki Road, Greece An almost 18-mile-long mountain road in Greece, Patiopoulo-Perdikaki Road is dangerous for many reasons. The road has an elevation gain of 2,706 feet, has no road markings, no guard r...