1 Dollar - Charles III Tallinn Old Town

Part of a sprawling series of miniature gold issues nominally tied to UNESCO World Heritage Sites, this piece is legal tender of Niue — a self-governing island in free association with New Zealand, population under 2,000, which has become one of the most prolific coin-issuing jurisdictions on earth precisely because it has no meaningful domestic coin economy to protect. Tallinn's medieval Old Town, preserved largely intact through Soviet-era neglect of private development, earned UNESCO status in 1997.