Mist and fog can be a cool effect to have in a travel, landscape or city photo. It is not something you can program, however, and when you are lucky enough to experience it, be ready with your camera.
There are few locations where it is easier to find mist and fog, others that are almost impossible. In all cases both mist and fog are seasonable.
These are the best tips to be ready with your camera. Planning is of course a big part of it.
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Learn where mist forms
Some locations are particularly susceptible to mist, such as river valleys, lakes and marshes. It can be a good idea to head towards these areas first, although the mist here can sometimes be too dense, obscuring trees and other landscape features completely.
If this is the case try to get as high as you can and work around the edges of any thicker banks of fog where parts of the landscape are still visible.