The world’s most unexpected border: these two countries seem to be a world apart, but high in the Hindu Kush mountains is a curvy 50-mile border between Afghanistan and China.

The only sane place to cross is the illegal unmarked border at Wakhjir Pass (15,780 feet), used only by the occasional drug smuggler:

This is also the largest time zone jump in the world (excluding the International Date Line) – cross into China at noon, and suddenly it’s 3:30 PM.