These are Zloty – Polish currency. Poland is part of the European Unit but does not use the Euro. They have 10, 20, 50 and 100 Zloty bills and 5, 2 and smaller Zloty coins. I had all but the 50 Zl bill and 5 Zl coin in my pocket and so took a picture. The faces on the bills are all very old Polish Kings (very old, since the last ended his reign in the early 1790s when Russia, German and Austria split Poland up between them). A Zloty has a value of about 25 US cents. But the money goes far: I have bought a large bag of groceries (fruit, water, yogurt, beer & etc.), almost as much as I can conveniently carry, for circa 70 Zloty. Basically, prices in Poland for food is about 20-25% of US prices. However, salaries are about 20-25% of ours. We love to complain at UMPI about our low pay, but my colleagues in Poland are paid much much less.