This deep valley in Sorrento, Italy, was once home to thriving wheat grinding mills. However, new developments in the city brought about localized climate change in the 19th century, making it too hot and humid for the grains and for the mill's employees. As a result, grinding operations were abandoned. Today, tourists can take a series of stone walkways down into the valley to get an up-close look at the mills, which were built in the 17th century. Some visitors simply look at the mills from the roadway above the valley, with many bringing along binoculars to get a closer look.