High in Iran's Azerbaijan province, at 2,300 meters above sea level, the village of Kandovan sits carved into cones of volcanic tuff. This episode of the Habitats of the World series follows the roughly 1,000 residents who still live in homes hollowed out of the rock, a practice with a history stretching back nearly a thousand years. The film shows how the stone dwellings, originally built for shelter and to take advantage of the fertile land below, have been fitted over generations with modern conveniences like plumbing and electricity without losing their original form. Interviews and observational footage trace the labor behind carving and maintaining these homes, and the meaning packed into the village's name, which references the hardship of that work. The camera moves through narrow stone lanes and inside the cave houses themselves, showing daily routines, shared courtyards, and the bond between residents and the mountain that shelters them. Kandovan is presented as the world's only still-inhabited troglodyte village, a claim the footage of everyday life there makes plausible.