6. Stelvio Pass
Nestled 9000 feet up in the Italian Alps, the Stelvio Pass packs 48 switchbacks (numbered by stone markers) into 15 miles. Its daunting turns have become a rite of passage for adventure-seeking drivers, motorcyclists and cyclists. Slicing around the mountain in the relative safety of your car, you might feel a swell of thankfulness for your engine. As one of the highest altitude runs through the Alps, Stelvio leaves all but the fittest of cyclists breathless.
5. Transfagarasan Highway
Built by Nicolae Ceausescu in the 1970s, this dynamite-forged highway defies the mountains that surround it, linking Transylvania and Walachia through a series of tunnels, bridges and viaducts. The blokes at Top Gear waxed poetic about this hard-to-pronounce highway, but we’re guessing the Romanian gem is still relatively unperturbed by the motoring masses