Part of Micronesia, the Pacific island of Yap has been home to an unusual kind of currency for centuries.
It consists of circular calcite discs up to 12 feet in diameter!
The stones were originally quarried in the Palau Islands. The arduous task of carving and transporting them 250 miles to Yap ensured they were highly valued.
Although the US dollar is now common in Yap, the large stone coins are still used for more traditional or ceremonial exchange.
Being so large and heavy, however, they’re rarely moved from their original positions.
[Credit: Eric Guinther]