The artificial mountain doubles as a waste-to-energy ... For a sustainable way to explore Copenhagen, consider biking — a way of life for its residents. With 340 miles of cycling paths, the ...

Strasbourg also has a bike-share system called Vélhop that allows for long-term rentals. It should come as no surprise that Copenhagen ranks first, especially now that there are more bikes than cars.

The best way to get around Copenhagen is on foot and by bike, especially when the weather is cooperating. If you're tired (or cold), you'll find a modern public transportation system that features ...