If you've ever dreamed of owning your own island, why not consider upgrading your dreams to owning your own country? The Principality of Sealand, which we noted in the "Nations" chapter of the 2007 World Almanac, is for sale. The "micronation" is a steel and concrete installation located about seven miles off the English coast in the North Sea. It was built as an anti-aircraft platform during World War II. After the war, the English Royal Navy abandoned the fort, and it remained abandoned until Paddy Roy Bates claimed it in 1967, declaring himself prince.
At the time, the English border extended only three miles off the coast (later expanded to 12 miles, in 1987). Neither the British government, nor any other country, has ever recognized Sealand's independence. Sealand, however, established its own constitution, national anthem, passports, currency, and stamps.
The Bates family no longer permanently resides in Sealand. Roy's son, Michael Bates, has put Sealand up for sale. A Spanish real estate firm has listed Sealand at 750 million euros (approx. $970 million).
The Principality of Sealand (Official site)
Real estate listing for Sealand (in Spanish)
Photo of Sealand (yes, that's the whole "nation") from Octal's Flickr stream (CC)

