Paige Smith of A Common Name Studio plants what she calls “urban geodes” throughout major cities. She utilizes building holes and pipes to house her artwork, created by paper and resin.

"You might go hunting for treasures, but you generally happen upon them during your adventures or casual interaction with the environment," Smith says on her website. If you live in one of the areas Smith has visited, be on the lookout for these gems—and perhaps be reminded to look out for the unexpected treasures in your own life.