Co-ordinates lead you to the general area but you'll need to solve several clues to find the exact location
A geocache capsule has been planted in Darley Park by Landau Forte College and Derby City Council.
The small metal tube is a key ingredient in the increasingly popular pastime of geo-caching.
The hi-tech treasure hunt invites people to track down the 'treasure capsules' using GPS trackers or mobile phones.
Landau Forte's capsule features various small prizes and a log book for people to sign before replanting it.
13-year-old Dan Aberg, from Normanton, helped to plant the capsule and he says geocaching is a great hobby.
Players are asked to replace the 'treasure' with something of equal value
He told BBC Radio Derby: "It's a really fun thing to do and it allows you to explore lots of different places.
"There are geocaches in countries all over the world."
The capsule is one of several planted in places by Derby City Council to help promote Darley Park and the Derwent Valley Mills World Heritage Site.
If you want to go looking for the capsules, a good starting point is the official