Cambodia - money

Cambodian money is very interesting, for at least a few reasons:

1. Cambodia is one of the poorest countries in the world.  Money has more utility there.

2. US dollars are used in Cambodia at a constant 4000:1 exchange rate to riel (the local currency), and preferred to it.  So strange to use US dollars and see USD prices halfway around the world!

3. The money has famous sites on it - for instance, the 500 riel bill has Angkor Wat, and the 1000 has the Angkor Thom.