Whenever I visit a foreign country, I make it my practice to cherry-pick examples of that country’s coins from circulation. For an expensive visit to a foreign country, coins make an inexpensive souvenir that only costs you the exchange rate of your dollars. They also make a memorable keepsake of your visit and interesting conversation pieces with your numismatic buddies back home! Sometimes I save examples of the circulating paper money when I travel. However, paper money is convertible back to dollars, and coins generally are not.