Did you ever notice how many coins have almost secret geometric patterns that pop out if you look closely? I was just studying the 1930s Italian lira and found a hidden tessellation that I think could be turned into a puzzle.

The lira from 1934 has a repeating swastika‑like motif that folds into a small, perfect hexagonal lattice when you line up the edges of the coin. It’s basically a mirrored version of the 1942 Italian “punto” pattern, but with a subtle offset that only shows up if you hold the coin at 45 degrees. For a scavenger‑hunt, split the pattern into three “chunks” that map to three cities. In each city, give a cryptic clue that points to a landmark where the local bank’s old coin mint building sits. Once the traveler photographs that building, they can overlay the image with a reference sheet and spot the hidden hexes that point to the next clue. The final puzzle is a set of coordinates that only line up when all three patterns are overlaid – the GPS treasure. Keep the clues short, the math tight, and the humor dry; nobody wants a full‑blown history lecture, just the thrill of finding something you weren’t supposed to see.