Here are ten of the world's most renowned highways:

1. Trans-Amazonian Highway: This highway spans over 4,000 miles through the Amazon rainforest in Brazil, connecting the country's northern and southern regions.

2. US Route 66: Also known as the "Main Street of America," US Route 66 is a historic highway that spans over 2,400 miles from Chicago to Santa Monica.

3. The Pan-American Highway: This is the world's longest highway, stretching over 19,000 miles from Prudhoe Bay, Alaska to Ushuaia, Argentina.

4. The Autobahn: The Autobahn is a German highway system that is famous for its unrestricted sections where drivers can legally drive at high speeds.

5. The Karakoram Highway: This highway connects Pakistan and China and is known for its stunning scenery and challenging terrain.

6. The Mumbai-Pune Expressway: This expressway in India is one of the country's first modern highways and connects the cities of Mumbai and Pune.

7. The Sydney Harbour Bridge: This iconic bridge in Sydney, Australia is a major highway that offers stunning views of the city and harbor.

8. The Pacific Coast Highway: This scenic highway in California, USA, offers stunning views of the Pacific Ocean and the California coastline.

9. The Tianmen Mountain Road: This road in China is known for its stunning scenery and challenging twists and turns as it winds its way through Tianmen Mountain National Park.

10. The Atlantic Road: This Norwegian highway offers stunning views of the country's coastline and is considered one of the most scenic drives in the world.

These highways are known for their stunning scenery, unique challenges and engineering marvels, making them popular tourist destinations for road trippers and car enthusiasts.