Last week, I took a trip to Luoyang city which is located in Henan province of central China. The city is one of the Four Great Ancient Capitals of China and it is noted for the Longmen Grottoes, a World Cultural Heritage site (2010, UNESCO).
The Big Vairocana and other massive Buddhist sculptures in the main grotto.
I bought a book "One hundred questions about the Longmen Grottoes" . A lot of things to learn, to know more about it ... The ticket is actually a pre-paid postcard (with domestic postage only ), some posting boxes are available inside the site so you can just write an address to share with your friend.
A small post office is found outside the site, located in the business street near the ticker office. Some nice postcards are available, about the grottoes also the city of Luoyang.