Swiss Freeports Are Home for a Growing Treasury of Art

They come for the security and stay for the tax treatment. For as long as goods are stored here, owners pay no import taxes or duties, in the range of 5 to 15 percent in many countries. If the work is sold at the Freeport, the owner pays no transaction tax, either.

(Via) Read this cool article in the NYT - the interesting thing is that I believe that there are several "off-the-grid" such locations around the world, including a massive one just outside of Boston... cough, cough.