One of the nation’s most unusual tourist attractions is Crater of Diamonds State Park in Arkansas, which bills itself as the only diamond-producing site in the world where ordinary folks actually can dig for diamonds themselves — and keep whatever they find. Park visitors get to peruse a 37.5-acre field that’s actually the eroded surface of an ancient, gem-bearing volcanic crater. Park officials make the search even easier by occasionally plowing the field to help bring the diamonds to the surface. For $6 plus a $30 deposit, they’ll even rent you a wooden screen and bucket so that you can sift though the soil.

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