From mountains to cities, some places around the world spend many days blanketed by fog each year. These hazy landscapes can recur so often in some locations that clear skies are the exception rather than the rule.
Fog can form for different reasons, and indeed it affects the landscape differently. In some parts of the world, it's even essential for the survival of animal and plant species.
In this gallery, you'll find some of the foggiest places on Earth. Click to explore them.