Not that anyone would really want to visit this place, but the Korean Demilitarized Zone is completely off-limits. This strip of land separating North and South Korea is a buffer zone between the two countries where they meet for negotiations.

The site is a no-mans-land surrounded by armed military guards, barbed wire, and it one of the heaviest mined borders. People can see the border, but they cannot get close to it or go inside for apparent reasons. South Korea has much more to offer than seeing a barbed-wire fence.
