Hiking trails

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Louisiana, Louisiana National Parks

Jean Lafitte National Historic Park and Preserve

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South Dakota, South Dakota National Parks

Jewel Cave National Monument

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California, California National Parks

Irvine Ranch

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New York, New York National Parks

Ironsides Island

Michigan, Michigan National Parks

Isle Royale National Park

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Minnesota, Minnesota National Parks

Itasca Natural Area

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California, California National Parks

Inyo National Forest

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New York, New York National Parks

Iona Island Marsh

Indiana, Indiana National Parks

Indiana Dunes National Lakeshore

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Alaska, Alaska National Parks

Iliamna Volcano