We travelled to North in Iran to Caspien Sea for two days. Caspien sea is on the other side of the Damdavad Mountains.
We had to drove up the mountains at 5 milies p/h. Then down at no more than 20 miles p/h. Although the trip took 10 hours, it was well worth it as the drive was very scenic. Lots of mountains and waterfalls and streams. Nice rafting places