Most of the town of Baarle-Hertog is in Belgium but some spots are in the Netherlands, sprinkled into the Belgian majority like chocolate chips, not divided neatly by a line.
The border is so complicated that there are some houses that are
divided between the two countries. There was a time when according to
Dutch laws restaurants had to close earlier. For some restaurants on
the border it meant that the clients simply had to change their tables
to the Belgian side.
The link is from Jason Kottke.