0 Euro Grotte du Pech Merle Cabrerets

The Pech Merle cave in the Lot department contains some of the best-preserved Paleolithic paintings in France, including spotted horse panels dated to roughly 25,000 years ago — older than Lascaux. The 0 Euro souvenir series, managed by the UEEEA and printed by Oberthur Fiduciaire under license from the ECB, has issued notes for hundreds of tourist sites across Europe since the mid-2010s, with individual sites commissioning their own designs in limited runs. These notes are legal curiosities: they carry the Euro Souvenir designation and pass ECB format approval, but carry no redemption value whatsoever.

Oberthur's involvement gives the physical object genuine banknote-grade paper and security features, which is precisely why collectors treat them as notes rather than novelty prints.