10 Dollars - Elizabeth II National Historical and Architectural Reserve 'Kamenetz'

Kamyanets-Podilskyi's fortress complex, which this coin commemorates, spent centuries trading hands between Lithuanian, Polish, Ottoman, and Russian controllers — the Ottomans held it from 1672 to 1699 after Sobieski's forces failed to relieve the garrison in time. The Cook Islands' prolific early 2000s bullion-adjacent program produced dozens of these 1-gram architectural issues, most in very limited quantities and sold directly into the collector market, meaning circulated examples are essentially nonexistent.