Whether or not you are traveling this summer...these international roads are a must-see, virtually or only for the brave, in-person.
Hana Highway, Hawaii
Maui's lush landscape is mesmerizing but so too is this winding road that snakes along the northeast coastline of the island. It takes drivers past rainforest, over little bridges, alongside trickling waterfalls, and around numerous hairpin bends. The dramatic coastal road, which is 52 miles (84km) long and goes between Pa'ia and Hana, has become a Hawaii must-do.
Stelvio Pass, Italy
Cyclists, motorbikers, and motorists alike laud this infamous mountain pass in the Italian alps near the Swiss border as one of the ultimate roads. At just over 9,000 feet (2,743m), Stelvio Pass is the second highest mountain pass in the Alps. But it's the 48 hairpin turns that make it the most amazing. The original road dates back to the 1820s. It's open between May and November.
Dadès Valley, Ouarzazate province, Morocco
This sinuous road in the Dadès Valley in the Ouarzazate province snakes down into a gorge, past staggering mountain scenery and ancient kasbahs. You'll pass through some of the High Atlas Mountains' most dramatic scenery on this extreme section of the R704 road, which was built down into the red-hued canyon of the Dadès River. It makes for a hair-raising but thrilling drive.
The Millau Suspension Bridge, France
Stretching proudly across the River Tarn in southern France, the Millau Suspension Bridge is an incredible structure. Follow the A75 autoroute to cross what is the world's tallest bridge and marvel at its engineering as well as the soaring views of the river and Massif Central mountains. In some parts, it's taller than the Eiffel Tower. The bridge, which opened in 2004, isn't accessible for pedestrians.
Trollstigen Mountain Road, Norway
Test your mettle on the fearsome-sounding Trollstigen, a mountain road that winds between the villages of Valldal in Indre Sunnmøre and Åndalsnes in Romsdalen and past awe-inspiring scenery. It opened in 1939 as an important transport passage and has become one of Norway's most popular sights. With 11 sharp bends (each named after one of the construction workers) and a steep incline, the incredible road was even hand hewn into the mountain in some parts. However, it's closed in the winter.
Overseas Highway, Florida, USA
One of the longest overwater roads in the world, Florida's Overseas Highway stretches from Miami on the mainland to Key West, the furthest of the islands. Completed in 1938, many sections of the highway were built over the route of the Florida East Coast Railway, which was irrevocably damaged in a hurricane. It's 113 miles (182km) long and has 42 bridges, including the famous Seven Mile Bridge. The route offers drivers magnificent views of the Keys and the Florida Straits.
Yungas Road, Bolivia
Another contender for the ultimate mountain pass has to be Bolivia's notorious Yungas Road. Also known as El Camino de la Muerte ("The Road of Death"), the extremely dangerous route goes from capital La Paz to Coroico. The narrow single-lane road is 38 miles (61km) long and goes up a 15,000-foot (4,572m) summit with sheer drops and not a barrier in sight. It's prone to severe rainfall, landslides, and tumbling rocks. The road was built in the 1930s by Paraguayan prisoners during the Chaco War.
Djurdjevica Bridge, Montenegro
Spanning the Tara River in northern Montenegro, historic Djurdjevica bridge is one of the country's most spectacular sights and a wonder to drive across. Gaze across at the hills, river and at the gaping canyon below. The lofty arched bridge was built between 1939 and 1940 and was the biggest vehicular concrete arch bridge in Europe when it was completed. During the Second World War the central arch was detonated to halt the Italian invasion. It was rebuilt in 1946.
Skippers Canyon Road, New Zealand
Skirting along the face of Skippers Canyon near Queenstown with sheer cliff drops down to Shotover River and tight turns, this unpaved road is not for the faint-hearted. The narrow passageway was built between 1883 and 1890 using hand-drilling for the gold miners during the Gold Rush and remains largely unchanged. The dramatic views of the scenic gorge are well worth the heart palpitations.
Tateyama Kurobe Alpine Route, Japan
Driving through towering corridors of snow that reach heights of up to 65 feet (20m) is one of the many staggering sights along the Tateyama Kurobe Alpine Route. The road traverses the Northern Japan Alps and it's best visited between April to mid-June to experience the high snow walls, which are on the stretch between Bijodaira to Murodo. Murodo is the highest point along the road at 8,038 feet (2,449m) above sea level. The road is closed from December until April.
San Boldo Pass, Italy
It's not very long but this extraordinarily curvy road in the Veneto region of northern Italy lures vintage car lovers around the globe to drive along it. The road, which was built by war prisoners and locals under Austrian command in 1918 between the towns of Trichiana and Tovena, is carved into the rocks. San Boldo Pass is so narrow that only one car can pass along it at a time so there are several sets of traffic lights along the way.
White Rim Road, Utah, USA
Four-wheel drive enthusiasts and mountain bikers love Canyonlands National Park in southeastern Utah for its network of off-road trails that have been forged around its deep canyons and dramatic landscapes. One of the best is the 100-mile White Rim Road, which loops around and below the towering Island in the Sky mesa.
Hardknott Pass, Cumbria, UK
The Lake District has plenty of jaw-droppingly gorgeous and hair-raising roads, but Hardknott Pass is one of the most dramatic in Britain. To take on the high-rise mountain pass, start at Little Langdale and proceed along the twisting Wrynose Pass which leads on to the even steeper, narrower Hardknott Pass and its seemingly endless hairpin bends. Stop along the way to see the remains of a 2nd century Roman Fort, which are just off the remote track.
Jacobs Ladder Road, Tasmania, Australia
As its name suggests, this is a seriously challenging road. Leading up to Ben Lomond National Park, an alpine plateau in northern Tasmania near Launceston, the steep and winding unsealed road features a series of mind-boggling switchbacks. It has become an attraction in its own right, especially for cyclists in training.