RoadmapGPS has collected points of interest for many areas of the United States. Most are local landmarks such as parks, historical markers, lakes, and summits (which many navigation systems don’t include in their standard POI database).
POI Areas by State
Arizona
California
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Colorado
Connecticut
District of Columbia
Florida
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Georgia
Indiana
Illinois
Kentucky
Louisiana
Massachusetts
Michigan
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Minnesota
Missouri
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Nevada
New York
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North Carolina
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Ohio
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Oregon
Pennsylvania
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Rhode Island
Tennessee
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Texas
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Utah
Virginia
Washington
Wisconsin