The 2007 $1 Million Canadian Gold Maple Leaf

The $1 million Canadian Gold Maple Leaf coin is a novelty coin if ever there was one, weighing in at a staggering 100 kilograms (220 pounds). As of February 2022, just six of the virtually pure gold coins have ever been produced, each with a face value of $1 million. They served as a display piece for the mint's one-ounce Gold Maple Leaf coins.

The coin was confirmed as the world's biggest gold coin by the Guinness Book of World Records in October 2007. The face of the coin depicts Queen Elizabeth II, while the reverse depicts a maple leaf from Canada. The coin is 50 centimeters in diameter and is slightly over an inch thick.

In 2010, the coin was auctioned for 3.27 million euros, which was little over $4 million at the time.

Price: $4 million