Niue, an island nation in the South Pacific, features Disney and “Star Wars” characters on its coins. This tiny island may have a meager population of about 1,200 — but it’s renowned for having Mickey Mouse on its money. The coins are legal tender on the Polynesian atoll, but around the world, they are being traded as collector’s items. In 2014, the most expensive coins were made from 7.1 grams of gold, featured Mickey and Minnie Mouse, Goofy and Pluto, and retailed for $625, although their denomination in Niue dollars was just $25.