Os de Civís is very close to the Spain–Andorra border, and is unique in being the only Spanish village that can be reached by vehicle only by going through Andorra. The border crossing is unique in Andorra in that there is no border control. Andorra is in neither the Schengen Area nor the European Union, and thus operates full border and customs checks at all other border crossings with Spain and France, but the crossing to Os de Civís is unpoliced as the road leads solely to the village, with no access to anywhere else in Spain. Os de Civís is therefore a pene -enclave – a place connected by land with the rest of the country or province, but to that in practice it can only be accessed through another country.  Maps, photos and full report here