JET, Okla. — Grab some sunscreen, shovels and water... it's time to dig for crystals! The Salt Plains National Wildlife Refuge in Jet, Okla. opens for crystal-digging season April 1 - Oct. 15.

It's almost crystal digging season in Oklahoma. Starting April 1, you can enjoy the 11,200-acre salt flats and collect the state crystal of Oklahoma free at the Salt Plains National Wildlife Refuge.

From lemons to ham, salt is a handy food preservative. But researchers studying some really old salt crystals found them preserving something else — evidence of life. "There are little cubes of the ...

The Sooner State boasts nine wildlife refuges, each offering a one-of-a-kind adventure in a different setting. For instance, when you're enjoying a serene escape in Medicine Park, considered America's ...