- Darryl and Kathleen Toupkin, an Arizona couple, have visited all 430 U.S. National Park units, finishing their journey at the St. Croix Island International Historic Site.
- Their adventure-started unintentionally as they simply enjoyed visiting national parks, later setting an official goal to visit every unit.
- The Toupkins documented their travels on their blog, inspiring others to explore America’s diverse-national-parks.
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