Welcome to Hikkim
Six kilometres south of Langza, a slight detour down from the road to Komic, little Hikkim is home to what's claimed to be the world's highest post office, 4440m above sea level. Some spoilsports say the post office at Everest Base Camp in Tibet is higher (5200m) but this is almost certainly the highest in India! It's also a house, and customers are often offered a cup of tea. They may have postcards to sell, but it's an idea to bring some anyway.
It's possible to hike direct from Kaza to Hikkim up the Kaza Nullah in two or three hours – steeper and harder, but shorter, than the 15km road route.