Pendeen Fogou wasn’t a very prepossessing site. To reach it, the three of us—my husband, Gary, our guide, Cheryl Straffon, and I—had to unfasten three rusty metal gates to venture ever deeper into a farmer’s cattle yard. The broken concrete beneath our feet was covered with several layers of dried (or drying) cow manure. Cattle were lowing and resting in their own muck in the nearby pens. 

Our goal was a six-foot-tall stone structure with tall grasses and weeds growing out of the top and a yawning opening in one wall. Before we could enter the site, we had one more obstruction: a detached farm gate, which the three of us hauled over to one side. 

Bending low, we followed Cheryl down a steep, stone-lined passage deep into the earth. I was grateful I had my hiking staffs to help keep me from slipping. At the bottom, the rocky passage leveled out. My flashlight illuminated moss-covered granite walls and ceiling, the large stones carefully placed to construct the fogou. Pronounced “foo-goo,” it’s a Cornish word that means “cave,” and it refers to a human-made underground cavern.