National Geographic : 1952 Dec
741 Kodachrome by Burt Kerr Todd Custom in the Himalayas Dictates that Men Ride Uphill but Walk Down Able craftsmen, the Bhutanese build sturdy forts and houses of stone, mud, and wood. Using no nails, they make dovetailing a fine art. Heavy stones hold shingles on the roofs. Chimneys are unknown.