Well, there is always Unter den Linden. 😈
If we are traveling to a country that we previously visited, we have a small amount of coins and low denomination bills from prior trips. Unfortunately, most are in currencies no longer in use - Marks, Francs, Liras, Kunas, Schillings, and Shillings. My Florints, Drachmas, and Korunas will soon join this list.