Hi Lisa.  Good place to start is NPS Harpers Ferry Center website on interpretive planning.  NPS has about 50 Long-Range Interpretive Plans posted there as pdfs for download.  All kinds of sites, from historic houses to national trails.  
regards,
Faye Goolrick
Certified Interpretive Planner
Goolrick Interpretive Group
www.goolrickgroup.com

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