The Gulf Coast of Florida (and surely, many other locations) has beaches where fossil shark teeth are abundant. My young nephews collect pails full of them! (That is my idea of a fun vacation: planted at the ocean, sifting shells and sand to hunt treasures.) On a brief recent visit to a beach near Venice, Florida, I spent about an hour on one of those beaches and made some amazing finds!
The WP Weekly Photo Challenge is to show “one”.