Some parts of the town of Baarle-Hertog, Belgium belong to The Netherlands. Which part? For that, you'll need a map.
Baarle-Hertog borders the Netherlands – but, because of its unique history of political division, the town is sort of marbled with competing national loyalties. In other words, pockets of the town are Dutch; most of the town is Belgian. You can thus wander from country to country on an afternoon stroll, as if island-hopping between sovereignties.
There are no border guards between the neighborhoods, and passports aren't necessary to move between the two nations. Link -via Boing Boing