Schellenberg
TL;DR
Schellenberg: smallest/northernmost commune, historical lordship united with Vaduz in 1719 to form the principality.
Schellenberg is Liechtenstein's smallest and northernmost commune, nestled against the Austrian border. The principality's unusual two-part geographic structure (the former Lordships of Vaduz and Schellenberg, united under the princes of Liechtenstein in 1719) gives this tiny commune historical significance disproportionate to its population.