Vallone dei Mulini (in English Valley of the Mills) is a historic valley in Sorrento, Italy. Nestled in a deep ravine between two towering cliffs, the mills, built from stone as far back as the 10th century, ground wheat for a thousand years until they were abandoned sometime in the 19th and 20th century due to a rise in humidity in the area. The nearly complete lack of ventilation, sun exposure, and the presence of tuff resulted to the mills be taken over by fern that thrives in the humid crevasse rawls across the roof of the mills.
It is considered one of the most enchanting views of the Sorrento Peninsula. It is known for its variety and unique plants.