Reporter Cassie Silver

It's the ultimate game of hide and seek... a treasure hunt that spans the world. Two million hidden items and there's a good chance there's one right near you

Dea and David Moynard are geocachers... the name given to treasure hunters who've joined the craze sweeping the country.

"We've done some 4 wheel driving, we've got push bikes so we can do push bike trails and stuff"

The Perth couple take geo-caching so seriously they've travelled the world ... hiding, and finding things left behind by fellow geo-cachers

"We've discovered or found over 5,000 both in Australia, in New Zealand and some in Asia".

Here's how it works... geo-cachers place boxes of all shapes and sizes in a top secret locations ... to find them, they use GPS co-ordinates and clues, it's a bit like the old fashioned orienteering, and it takes you to places you might never even know existed.

Over bridges, underwater, even cleverly disguised in a tree.

Makes you wonder what's so exciting in those little boxes. Well that's the thing, we don't know ... you see, the geo-cache prize is always a tightly guarded secret

"Some of them could be in exposed public places and you sort of get there and think where could it possibly be" Dea and David say.

Geo-cache comes from the words Geography - geo ... and cache, the term used in computer for storing of information.

2.3 million caches are hidden around the globe with six million searchers in this real life race to find them first

"They are everywhere from Kununurra, Onslow, Broome, Esperance and everywhere in between"

David and Dea are so hooked, they've sold up ... so they can travel the country hunting for treasure.

"We can really see it fitting in, taking us to some awesome places we would have never known about".

Once you find a cache you sign the log book inside ... and then swap it for a treasure of your own

Griffin Longley from Nature Play WA says teaching kids and getting families out and about

"The great thing about geocaching is that you can be active as a family and having a lot of fun in a very short period of time. You can do it anywhere anytime you don't need to pay fees you don't need to join club or don't need a uniform you can just step out your front door or your office and be active in it straight away" Griffin says.

And it's also given our little ones a lesson in respect

"People have to put back what they find, there's lots of swapping, people leave messages or trinkets within a geocache and take something away"

You mightn't know it ... but there are 53,000 geocaches tucked away around Australia... in your street, suburb, or city

"Anytime that you are walking around you will be within a few 100 metres of a geocache in fact you would have walked past multiple geocaches today" says Griffin.