Condé Nast Traveler:

Gordon College finance professor Alexander Lowry looks at the history, designs, and security features of the most widely circulated currencies around the world. Lowry begins with the U.S. dollar then moves through the British pound, the euro, the Japanese yen, Chinese yuan, Australian dollar, Canadian dollar, the Indian rupee, the Mexican peso, the Swiss franc, the Swedish krona, and more.

Currency in general fascinates me (who doesn’t like money, amirite) especially the lengths countries go to not only differentiate their currency from others (countries and denominations) but also the security measures they put in place and how they are integrated into the look and feel of a their money.