Cloud forest in Shahrud 

Jangal-e Abr literally meaning cloud forest is located in Shahrud, Semnan province. Two or 3 hours left to the sunset, with temperature fall, clouds rush into the forest. They are so thick that it seems you are walking on the clouds, and then you may not be able to see a meter ahead of you. The forest is full of steep hills, and a river runs through it. Summer is the best time to visit the forest.