The original edition sparked so much debate among readers that we had to revisit the subject.

[Editor's note: This list is based almost entirely on reader comments from the original post, The World's Most Spectacular Roads. Plus a couple of my personal favorites.]

1

Milford Road

Not to be confused with the famous Milford Track trekking route, the Milford Road State Highway 94 passes through the Southern Alps of New Zealand's South Island.Photo: macronix

2

Stelvio Pass

48 hairpin turns up to a 2757m (9045ft) pass in the Italian Alps, and Top Gear's pick for "greatest driving road in the world."Photo: Damian Morys Foto

3

Great Ocean Road

This coastal road in Victoria, Australia, runs for 241km, between Torquay and Warrnambool. The car-less might consider the Great Ocean Walk as an alternative.Photo: Stas Kulesh

Intermission
37

20 overlooked national landmarks in the US that are worth a visit

by Hal Amen

25 images of Thailand’s most beautiful temples

by Daniel Nahabedian
13

World’s most impressive bridges, vol. 2

by Hal Amen
4

Chalus Road, Iran

Tehran is connected to the northern city of Chalus via this road through the Alborz Mountains. Check this site for more images.Photo: ninara

5

Cabot Trail

Wrapping around northern Nova Scotia's Cape Breton Island, the Cabot Trail is mountainous and windy with near-constant ocean views. I recommend biking it.Photo: kennymatic

6

Interstate 70, Glenwood Springs, CO

The Colorado River, of Grand Canyon fame, carved this canyon billions of years ago. The U.S. government built the 12-mile, $490 million interstate route through it, which was only completed in 1992.Photo: Payton Chung

7

Millau Bridge

Southern France's Millau Bridge is the tallest in the world -- taller, actually, than the Eiffel Tower.Photo: tibchris

8

Karakoram Highway

The "highest paved international road in the world" connects Pakistan with Xinjiang, China. It is currently closed at the Hunza Valley due to a massive landslide.Photo: Umair Mohsin

9

Snowdonia, Wales

Mountainous northern Wales is traversed by many of these ancient, narrow, stone-walled roads. I've experienced the challenge of navigating them at night. With oncoming traffic. Car renters beware.Photo: Richard0

Intermission

10 of the most nerve-wracking roads in the Americas

by Joe Batruny
11

World’s most impressive bridges, vol. 1

by Hal Amen
3

41 photos of the world’s most spectacular waterfalls

by Rory Moulton
10

Ice road, Northwest Territories

Winter means greater accessibility in northern Canada. This frozen road runs up the Northwest Territories.Photo: madmack66

11

Chapman's Peak road

Another great coastal road, this one just 15 miles south of Cape Town, South Africa .Photo: Raveesh Vyas

12

Peru mountain pass

Most mountain pass roads in Peru qualify as "spectacular." This one runs north from the Sacred Valley town of Ollantaytambo and is part of the car route to Machu Picchu.Photo: ThiagoJ

13

Liwa desert highway

Roads through the desert oasis of Liwa, Abu Dhabi, stretch long.Photo: Luca Assen

14

Going-to-the-Sun Road, Montana

The only route through Glacier National Park was featured in the opening scenes of "The Shining."Photo: Colin Gregory Palmer

15

Mývatn, Iceland

Mývatn is a volcanically active region in northern Iceland. This road will take you there.Photo: Francesco_G

Intermission
3

National park road trip guide in photos

by John Bair
9

Canadian natural beauty across the country

by Carlo Alcos
14

The ultimate Ireland road trip, in pictures

by Scott Sporleder
16

Seven Mile Bridge

U.S. Highway 1 runs for miles over the water, connecting the Florida Keys to the mainland. It includes this long span of bridge.Photo: milan.boers

17

Gotthard Pass, Alps

Traveling north from Italy into Switzerland, you'll come to Gotthard Pass, which you can cross on either the new, straightforward road, or the old roller coaster above. My money's on the latter.Photo: Mikael Miettinen

18

High Atlas pass

I recently drove over the 2260m Tichka Pass in Morocco on my way to Zagora to ride a camel. The pass was cooler. No offense, camel.Photo: cliffwilliams

19

Pacific Coast Highway, California

This is the only road getting reprised from the original post. It seems to deserve it.Photo: tibchris

20

Dingle Peninsula, Ireland

The roads of western Ireland are narrow, flanked by green, and sometimes charmed.Photo: ktylerconk