The Principality of Liechtenstein is a doubly landlocked alpine country in Central Europe. Its area is just over 160 sq. km, and it has an estimated population of 35,000. Its capital is Vaduz. The biggest town is Schaan.
Liechtenstein is the smallest yet the richest German-speaking country in the world and the only country to lie entirely within the Alps. Liechtenstein is divided into 11 municipalities. Much of its terrain is mountainous, making it a winter sports destination. (source)
It is known as a principality as it is a constitutional monarchy headed by a prince. Hans-Adam II (1945), is the reigning Prince of Liechtenstein. On 30 July 1967, he married Countess Marie Aglaë Kinsky von Wchinitz und Tettau (1940) who, upon her husband's accession to the throne, became Her Serene Highness The Princess of Liechtenstein. Their official residence is at Vaduz Castle, which overlooks the capital. (source)
Thank you Zasa for adding a new country to my collection!