When Forrest Fenn believed he was to die from a 1988 cancer diagnosis, he had envisioned a peaceful place for himself to lay down and die in the Rocky Mountains of Colorado.

Beating the diagnosis, in 2010 he wrote a Memoir that contained a 24 line poem that, if solved, would lead to the location, where he had hidden a treasure chest, with gold and other treasures worth a million dollars.

In 2020 the mystery was finally cracked, and Fenn passed, aged 90. There is much controversy surrounding this book, well worth a read in it's own right.

Here are two such articles - from Outside and The Guardian