0 Euro - Hundertwasserhaus Wien

Euro Souvenir notes occupy a strange niche — legal novelty items denominated at zero, produced under license from the European Central Bank, which permits their issue provided they cannot be mistaken for genuine euro banknotes. Oberthur Fiduciaire, one of the major security printers behind actual euro production, prints these with full intaglio and security features anyway, which gives them a tactile quality that outclasses most real circulating currency from smaller nations.

The Hundertwasserhaus in Vienna, completed in 1986, was a municipal social housing project — an unusual subject for a collectible, though Friedensreich Hundertwasser's insistence on uneven floors and tree-filled terraces made it an architectural landmark rather than ordinary council stock.