Joint Security Area (JSA), Panmunjeom. The blue UN buildings lie on the 1953 ceasefire line between North and South Korea. The large building behind the UN buildings represents the North Korean authorities.  There's a special dress and behavior code in the JSA. A nice suit is required, jeans, for example, are not allowed.  I was lucky to have my nice conference dress with me. Moreover, you are not allowed to point with your fingers on North Korean facilities since you are constantly whatched from the North. And we had to move to the UN buildings in a single line without stopping and breaking it.