1 Dollar - Elizabeth II Salvator Mundi: 6/6

The Salvator Mundi attributed to Leonardo da Vinci sold at Christie's New York in November 2017 for $450.3 million, the highest price ever achieved at auction for a painting. That sale — and the surrounding controversy over the attribution's legitimacy — made it the most publicly debated artwork of the decade, which explains why it anchored a six-coin bullion series from Niue rather than a single commemorative issue.

The painting's whereabouts after the sale remain officially undisclosed, last reported in the possession of the Saudi sovereign wealth fund.