The town of Kandovan in western Iran is made up of a cluster of ancient caves carved into the soft volcanic rock. Cave residents appreciate their homes' historic legacy -- and their comfort.

Iran's currency has dropped sharply this year, and U.S. sanctions on the country are expected to further undermine its economy. The financial instability is taking a toll on the large numbers of Afghan migrants who live in Iran, forcing many to return home to their war-torn country.